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Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net Investment Income [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings for the period $ 383 $ 35,184
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 0 0
Gain (Loss) on Derivative Instruments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings for the period 8,187 (9,375)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 8,096 (9,481)
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings for the period 152,147 (111,629)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 152,147 (111,629)
Other Income or (Loss) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings for the period (368) (358)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held $ (368) $ (358)