Hannon Armstrong Sustainable Infrastructure Capital, Inc. Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Summary of Anticipated Maturity Dates of Financing Receivables and Investments and Weighted Average Yield (Detail)

v3.4.0.3

Our Portfolio - Summary of Anticipated Maturity Dates of Financing Receivables and Investments and Weighted Average Yield (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Receivables [Abstract]
Financing Receivables, Maturities total	$ 819
Financing Receivables, Maturities in less than 1 year	0
Financing Receivables, Maturities in 1-5 years	130
Financing Receivables, Maturities in 5-10 years	39
Financing Receivables,Maturities in more than 10 years	$ 650
Financing Receivables, weighted average yield total	5.00%
Financing Receivables, weighted average yield in less than 1 year	4.00%
Financing Receivables, weighted average yield in 1-5 years	6.00%
Financing Receivables, weighted average yield in 5-10 years	4.00%
Financing Receivables, weighted average yield in more than 10 years	5.00%
Investments, Maturities total	$ 37
Investments, Maturities in less than 1 year	0
Investments, Maturities in 1-5 years	0
Investments, Maturities in 5-10 years	1
Investments, Maturities in more than 10 years	$ 36
Investments, weighted average yield total	4.00%
Investments, weighted average yield in less than 1 year	0.00%
Investments, weighted average yield in 1-5 years	0.00%
Investments, weighted average yield in 5-10 years	5.00%
Investments, weighted average yield in more than 10 years	4.00%

- Definition

Financing Receivable Due Five To Ten Years

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivableDueFiveToTenYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable Due Less Than One Year

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivableDueLessThanOneYear
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable Due More Than Ten Years

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivableDueMoreThanTenYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable Due One To Five Years

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivableDueOneToFiveYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivables

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivables
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing receivables weighted average yield.

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivablesWeightedAverageYield
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivables weighted average yield due five to ten years.

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivablesWeightedAverageYieldDueFiveToTenYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivables weighted average yield due less than one year.

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivablesWeightedAverageYieldDueLessThanOneYear
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivables weighted average yield due more than ten years.

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivablesWeightedAverageYieldDueMoreThanTenYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivables weighted average yield due one to five years.

+ References

No definition available.

+ Details

Name:	hasi_FinancingReceivablesWeightedAverageYieldDueOneToFiveYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Investments Due Five To Ten Years

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsDueFiveToTenYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments Due Less Than One Year

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsDueLessThanOneYear
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments Due More Than Ten Years

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsDueMoreThanTenYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments Due One To Five Years

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsDueOneToFiveYears
Namespace Prefix:	hasi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments weighted average yield.

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsWeightedAverageYield
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Investments Weighted Average Yield Due Five To Ten Years

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsWeightedAverageYieldDueFiveToTenYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Investments weighted average yield due less than one year.

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsWeightedAverageYieldDueLessThanOneYear
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Investments weighted average yield due more than ten years.

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsWeightedAverageYieldDueMoreThanTenYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Investments Weighted Average Yield Due One To Five Years

+ References

No definition available.

+ Details

Name:	hasi_InvestmentsWeightedAverageYieldDueOneToFiveYears
Namespace Prefix:	hasi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration