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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) - Successor [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Available-for-sale Securities $ 3,993,015 $ 5,309,161   $ 3,993,015   $ 5,309,161      
Ambac insured Re-remic [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Coupon rate   2.05%       2.05%      
Fair Value Inputs Maturity           7 months 24 days      
Yield   0.00%       0.00%      
Variable Interest Entity, Primary Beneficiary [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held           $ (71,072) $ 266,629    
Fair Value, Inputs, Level 3 [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 11,110,155 $ 12,561,185 $ 12,044,498 11,110,155 $ 12,044,498 12,561,185 11,369,112 $ 11,950,737 $ 11,588,457
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 37,791   90,285 (48,387) 343,534        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (691,566)   412,299 (313,415) 602,225        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     25,930 0 35,781        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0 (79,319)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 181,498   72,473 1,083,919 (248,913)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         22,078        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three 5,309     5,309          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 37,418   23,931 (84,050) 269,852        
Fair Value, Inputs, Level 3 [Member] | RMBS Cash Flows Consisting of Deferred Amounts [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Available-for-sale Securities 0 709,950   0   709,950      
Fair Value, Inputs, Level 3 [Member] | Ambac insured Re-remic [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Available-for-sale Securities   26,067       26,067      
Fair Value, Inputs, Level 3 [Member] | Corporate Obligations [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Available-for-sale Securities 0 0   0   0      
Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability             2,622,566    
Available-for-sale Securities 2,756,924 2,914,145   2,756,924   2,914,145      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         (31,454)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         147,131        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements         (15,927)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         (31,454)        
Derivative [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 45,613 60,808 52,729 45,613 52,729 60,808 (100,282) 49,908 (102,588)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (2,682)   54,115 (12,057) 51,298        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss   0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases   0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales   0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 1,613   (101,202) 3,138 101,713        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held (2,773)   4,240 (12,254) 3,914        
Derivative [Member] | Interest Rate Swap [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 46,939 61,374   46,939   61,374      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       (11,494)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       2,941          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (11,494)          
Derivative [Member] | Credit Derivative [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability (1,326) (566)   (1,326)   $ (566)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       (563)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       197          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held       (760)          
Credit Derivative [Member] | Derivative [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability     (9,006)   (9,006)   (15,349)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         7,676        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements         (1,333)        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         51        
Credit Derivative [Member] | Derivative [Member] | Credit Derivative [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability (1,326)   (9,006) (1,326) (9,006)     (1,018) (14,496)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (217)   6,624            
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 Sales   0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 91   1,134            
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held (308)   191            
Interest Rate Swap [Member] | Derivative [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability     61,735   61,735   $ (84,933)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         43,622        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales         0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements         103,046        
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         3,863        
Interest Rate Swap [Member] | Derivative [Member] | Interest Rate Swap [Member]                  
Fair Value Inputs, Assets, Quantitative Information [Line Items]                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 46,939   61,735 $ 46,939 $ 61,735     $ 50,926 $ (88,092)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (2,465)   47,491            
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 Sales   $ 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 1,522   (102,336)            
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held $ (2,465)   $ 4,049