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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, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 1,509,132 $ 1,138,880
Estimated Fair Value $ 1,536,638 $ 1,174,305
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 $ 1,378,027 $ 947,183
Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 111,243 162,237
Debt Service Coverage Ratio Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 19,862 29,460
Loan To Value Ratio Less Than 65%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 975,201 1,111,752
Estimated Fair Value $ 1,000,948 $ 1,146,030
Recorded Investment, % of Total 64.60% 97.60%
Estimated Fair Value, % of Total 65.10% 97.60%
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 869,470 $ 930,592
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 85,869 151,700
Loan To Value Ratio Less Than 65% | Debt Service Coverage Ratio Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 19,862 29,460
Loan To Value Ratio 65% to 75%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 533,931 27,128
Estimated Fair Value $ 535,690 $ 28,275
Recorded Investment, % of Total 35.40% 2.40%
Estimated Fair Value, % of Total 34.90% 2.40%
Loan To Value Ratio 65% to 75% | Debt Service Coverage Ratio >1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 508,557 $ 16,591
Loan To Value Ratio 65% to 75% | Debt Service Coverage Ratio 1.00x - 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 25,374 $ 10,537
Loan To Value Ratio 76% to 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment, % of Total 0.00% 0.00%
Estimated Fair Value, % of Total 0.00% 0.00%
Loan To Value Ratio Greater than 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment, % of Total 0.00% 0.00%
Estimated Fair Value, % of Total 0.00% 0.00%