Quarterly report pursuant to Section 13 or 15(d)

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

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Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables $ 736,000 $ 736,000  
Financing receivables held-for-sale 41,206 41,206 $ 62,275
Investments 28,186 28,186 27,273
Real estate 155,000 155,000  
Equity method investments 165,280 165,280 $ 143,903
Total 1,100,000 1,100,000  
Average Remaining Balance 11,000 11,000  
Commercial Investment Grade [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 408,000 408,000  
Investments 15,000 15,000  
Real estate 155,000 155,000  
Total 578,000 578,000  
Average Remaining Balance 10,000 10,000  
Commercial Non-Investment Grade [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Investments 13,000 13,000  
Total 13,000 13,000  
Average Remaining Balance $ 13,000 $ 13,000  
Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]      
Financing Receivable, Recorded Investment [Line Items]      
% of Debt and Real Estate Portfolio 99.00%    
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   60.00%  
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   1.00%  
Government [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables $ 328,000 $ 328,000  
Financing receivables held-for-sale 41,000 41,000  
Total 369,000 369,000  
Average Remaining Balance 11,000 $ 11,000  
Government [Member] | Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]      
Financing Receivable, Recorded Investment [Line Items]      
% of Debt and Real Estate Portfolio   39.00%  
Subtotal, Debt and Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 736,000 $ 736,000  
Financing receivables held-for-sale 41,000 41,000  
Investments 28,000 28,000  
Real estate 155,000 155,000  
Total 960,000 960,000  
Average Remaining Balance 10,000 $ 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 165,000 $ 165,000  
Total 165,000 165,000  
Average Remaining Balance $ 15,000 $ 15,000