Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt - Additional Information Related to Other Nonrecourse Debt by Interest Rate (Detail)

v3.4.0.3
Nonrecourse Debt - Additional Information Related to Other Nonrecourse Debt by Interest Rate (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Other nonrecourse debt, Balance $ 94,231 $ 100,602
Fixed-Rate Promissory Notes, Interest Rates from 2.26% to 5.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Balance 31,000 33,000
Fixed-Rate Promissory Notes, Interest Rates from 5.01% to 6.50% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Balance 42,000 46,000
Fixed-Rate Promissory Notes, Interest Rates from 6.51% to 8.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Balance $ 21,000 $ 22,000
Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.26% to 5.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2017 2017
Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 5.01% to 6.50% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2017 2017
Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 6.51% to 8.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2019 2019
Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.26% to 5.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2032 2032
Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 5.01% to 6.50% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2031 2031
Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 6.51% to 8.00% Per Annum [Member]    
Debt Instrument [Line Items]    
Other nonrecourse debt, Maturity 2031 2031