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Schedule of Credit Quality of Commercial Mortgage Loans Held-For-Investment (Detail) - Commercial Mortgage Loans - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 1,455,156 $ 1,509,132
Estimated Fair Value $ 1,465,113 $ 1,536,638
Recorded Investment, % of Total 100.00% 100.00%
Estimated Fair Value, % of Total 100.00% 100.00%
Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 1,381,742 $ 1,378,027
Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 62,060 111,243
Debt Service Coverage Ratio Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 11,354 19,862
Loan To Value Ratio Less Than 65%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 833,246 975,201
Estimated Fair Value $ 848,702 $ 1,000,948
Recorded Investment, % of Total 57.30% 64.60%
Estimated Fair Value, % of Total 57.90% 65.10%
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 785,149 $ 869,470
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 36,743 85,869
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 11,354 19,862
Loan To Value Ratio 65% to 75%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 606,505 533,931
Estimated Fair Value $ 601,587 $ 535,690
Recorded Investment, % of Total 41.70% 35.40%
Estimated Fair Value, % of Total 41.10% 34.90%
Loan To Value Ratio 65% to 75% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 581,188 $ 508,557
Loan To Value Ratio 65% to 75% | Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 25,317 $ 25,374
Loan To Value Ratio 76% to 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 10,493  
Estimated Fair Value $ 10,494  
Recorded Investment, % of Total 0.70% 0.00%
Estimated Fair Value, % of Total 0.70% 0.00%
Loan To Value Ratio 76% to 80% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 10,493  
Loan To Value Ratio Greater than 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 4,912  
Estimated Fair Value $ 4,330  
Recorded Investment, % of Total 0.30% 0.00%
Estimated Fair Value, % of Total 0.30% 0.00%
Loan To Value Ratio Greater than 80% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 4,912