Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 819,000  
Financing receivables held-for-sale 42,041 $ 60,376
Investments 36,733 29,017
Real estate 163,000  
Equity method investments 304,180 $ 318,769
Total 1,365,000  
Average Remaining Balance 12,000  
Commercial Investment Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 428,000  
Investments 16,000  
Real estate 163,000  
Total 607,000  
Average Remaining Balance 10,000  
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 57.00%  
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 $ 374,000  
Financing receivables held-for-sale 42,000  
Investments 21,000  
Total 437,000  
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 41.00%  
Subtotal, Debt and Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 819,000  
Financing receivables held-for-sale 42,000  
Investments 37,000  
Real estate 163,000  
Total 1,061,000  
Average Remaining Balance $ 11,000  
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 $ 304,000  
Total 304,000  
Average Remaining Balance $ 25,000