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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Inputs, Level 3 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability $ 7,138,755 $ 11,950,737 $ 6,930,446 $ 12,561,185
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 160,349 (86,178)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 134,688 378,151    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 86,728 902,421    
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 159,875 (121,468)    
Derivative [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 53,034 49,908 46,001 60,808
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 8,187 (9,375)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 1,154 1,525    
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 8,096 (9,481)    
Credit Derivative [Member] | Credit Derivative [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability (1,077) (1,018) (1,459) (566)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 473 (346)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 91 106    
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 382 (452)    
Interest Rate Swap [Member] | Interest Rate Swap [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 54,111 50,926 $ 47,460 $ 61,374
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 7,714 (9,029)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 1,063 1,419    
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held $ 7,714 $ (9,029)