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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Privately Issued [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 41 $ 65 $ 44 $ 74
Total gains (losses) realized/unrealized:        
Settlements (6) (8) (9) (17)
Ending Balance 35 57 35 57
Other Assets and Other Liabilities [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance 16,202 16,885 7,325 9,879
Total gains (losses) realized/unrealized:        
Included in earnings 19,571 35,430 43,511 59,328
Transfers in and/or out of Level 3 (a) (23,348) (30,932) (38,411) (47,824)
Ending Balance 12,425 21,383 12,425 21,383
Changes in unrealized gains included in earnings related to assets still held at end of period $ 10,892 19,822 $ 12,372 20,661
Collateralized Debt Obligations [Member]        
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance   45,040   47,393
Total gains (losses) realized/unrealized:        
Included in other comprehensive income   (1,070)   (3,218)
Settlements   (665)   (870)
Ending Balance   $ 43,305   $ 43,305