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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Privately Issued [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 57 $ 88 $ 74 $ 103
Total gains (losses) realized/unrealized:        
Settlements (6) (6) (23) (21)
Ending Balance 51 82 51 82
Collateralized Debt Obligations [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance 43,305 50,483 47,393 50,316
Total gains (losses) realized/unrealized:        
Included in earnings 28,475   28,475  
Included in other comprehensive income (15,050) (472) (18,268) 5,153
Sales (56,730)   (56,730)  
Settlements   (135) (870) (5,593)
Ending Balance   49,876   49,876
Other Assets and Other Liabilities [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance 21,383 11,206 9,879 17,347
Total gains (losses) realized/unrealized:        
Included in earnings 45,534 21,709 104,862 67,611
Transfers in and/or out of Level 3 (37,117) (15,268) (84,941) (67,311)
Ending Balance 29,800 17,647 29,800 17,647
Changes in unrealized gains included in earnings related to assets still held at end of period $ 27,663 $ 15,488 $ 29,288 $ 15,965