Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail)

v3.5.0.2
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 804,000  
Financing receivables held-for-sale 42,285 $ 60,376
Investments 47,662 29,017
Real estate 162,000  
Equity method investments 334,565 $ 318,769
Total 1,391,000  
Average Remaining Balance 12,000  
Commercial Investment Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 415,000  
Investments 15,000  
Real estate 162,000  
Total 592,000  
Average Remaining Balance 9,000  
Commercial Non-Investment Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 17,000  
Total 17,000  
Average Remaining Balance $ 17,000  
Credit Concentration Risk [Member] | Commercial Investment Grade [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Recorded Investment [Line Items]    
% of Debt and Real Estate Portfolio 56.00%  
Credit Concentration Risk [Member] | Commercial Non-Investment Grade [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Recorded Investment [Line Items]    
% of Debt and Real Estate Portfolio 2.00%  
Government [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 372,000  
Financing receivables held-for-sale 42,000  
Investments 33,000  
Total 447,000  
Average Remaining Balance $ 12,000  
Government [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Recorded Investment [Line Items]    
% of Debt and Real Estate Portfolio 42.00%  
Subtotal, Debt and Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 804,000  
Financing receivables held-for-sale 42,000  
Investments 48,000  
Real estate 162,000  
Total 1,056,000  
Average Remaining Balance $ 10,000  
Subtotal, Debt and Real Estate [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]    
Financing Receivable, Recorded Investment [Line Items]    
% of Debt and Real Estate Portfolio 100.00%  
Equity Method Investments [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Equity method investments $ 335,000  
Total 335,000  
Average Remaining Balance $ 21,000