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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (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
Investment by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period $ 77,630   $ 721,624 $ 808,557 $ 762,703 $ 762,703  
Included in earnings 282   16,479 35,466 26,298    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (3,514)   10,812 (56,022) 17,097    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     25,930   35,781    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales         (79,319)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (287)   (9,163) (713,890) (18,956)    
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) 0    
Balance, end of period 68,802 $ 808,557 765,682 68,802 765,682 808,557 $ 762,703
Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 49,908   (102,588) 60,808 (100,282) (100,282)  
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)    
Balance, end of period 45,613 60,808 52,729 45,613 52,729 60,808 (100,282)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 2,773   (4,240) 12,254 (3,914)    
Credit Derivative [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period         (15,349) (15,349)  
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    
Balance, end of period     (9,006)   (9,006)   (15,349)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date         (51)    
Interest Rate Swap [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period         (84,933) (84,933)  
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)    
Balance, end of period     61,735   61,735   (84,933)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date         (3,863)    
Non-Agency RMBS [Member] | Investment by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 5,309   655,817 736,017 696,713 696,713  
Included in earnings     16,123 34,727 25,589    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     11,367 (52,138) 17,931    
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 0   (8,921) 713,297 18,457    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three       0 22,078    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three (5,309)     5,309 0    
Balance, end of period 0 736,017 700,316 0 700,316 736,017 696,713
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       0 0    
Asset-backed Securities [Member] | Investment by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 72,321   65,807 72,540 65,990 65,990  
Included in earnings 282   356 739 709    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (3,514)   (555) (3,884) (834)    
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 (287)   (242) (593) (499)    
Balance, end of period 68,802 72,540 65,366 68,802 65,366 72,540 65,990
Interest Rate Swap [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period       61,374      
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)      
Balance, end of period 46,939 61,374   46,939   61,374  
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       11,494      
Interest Rate Swap [Member] | Interest Rate Swap [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 50,926   (88,092)        
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        
Balance, end of period 46,939   61,735 46,939 61,735    
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 2,465   (4,049)        
Credit Derivative [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period       (566)      
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)      
Balance, end of period (1,326) (566)   (1,326)   (566)  
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       760      
Credit Derivative [Member] | Credit Derivative [Member] | Derivatives by Class [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period (1,018)   (14,496)        
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)        
Balance, end of period (1,326)   (9,006) (1,326) (9,006)    
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 308   (191)        
Level 3 [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 11,950,737   11,588,457 12,561,185 11,369,112 11,369,112  
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)      
Balance, end of period 11,110,155 12,561,185 12,044,498 11,110,155 12,044,498 12,561,185 11,369,112
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (37,418)   (23,931) 84,050 (269,852)    
Level 3 [Member] | Investments Contract [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, end of period     2,722,316   2,722,316    
Level 3 [Member] | Loans [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, end of period     11,301,298   11,301,298    
Level 3 [Member] | Long-term Debt [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, end of period     (2,804,218)   (2,804,218)    
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period         (100,282) (100,282)  
Included in earnings         51,298    
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         (101,713)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0    
Balance, end of period             (100,282)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date         (3,914)    
Level 3 [Member] | Investments [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 77,630   721,624 808,557 762,703 762,703  
Included in earnings 282   16,479 35,466 26,298    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (3,514)   10,812 (56,022) 17,097    
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 (287)   (9,163) (713,890) 18,956    
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)      
Balance, end of period 68,802 808,557 765,682 68,802 765,682 808,557 762,703
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       0 0    
Level 3 [Member] | Other Assets [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 5,621   7,039 5,979 7,382 7,382  
Included in earnings (366)   (348) (724) (691)    
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       0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       0      
Balance, end of period 5,255 5,979 6,691 5,255 6,691 5,979 7,382
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 366   348 724 691    
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period       60,808      
Included in earnings       (12,057)      
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       (3,138)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       0      
Balance, end of period 45,613 60,808 52,729 45,613 52,729 60,808  
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       12,254      
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 49,908   (102,588)        
Included in earnings (2,682)   54,115        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (1,613)   101,202        
Balance, end of period 45,613   52,729 45,613 52,729    
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 2,773   (4,240)        
Variable Interest Entity, Primary Beneficiary [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date           71,072 (266,629)
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Investments Contract [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period       2,914,145      
Included in earnings       (73,163)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (66,463)      
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       (17,595)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       0      
Balance, end of period 2,756,924 2,914,145   2,756,924   2,914,145  
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       73,163      
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period       11,529,384      
Included in earnings       (175,122)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       (248,703)      
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       (354,360)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       0      
Balance, end of period 10,751,199 11,529,384   10,751,199   11,529,384  
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date       175,122      
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Long-term Debt [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period (2,696,516)   (2,716,642) (2,757,688) (2,582,220) (2,582,220)  
Included in earnings 17,228   14,100 177,213 (80,307)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 161,650   (102,138) 57,773 (148,394)    
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 0   462 5,064 (6,703)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       0      
Balance, end of period (2,517,638) $ (2,757,688) (2,804,218) (2,517,638) (2,804,218) (2,757,688) (2,582,220)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (17,228)   (14,100) (177,213) 80,307    
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans Receivable [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period         10,658,963 10,658,963  
Included in earnings         378,390    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         586,391    
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         322,446    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0    
Balance, end of period             10,658,963
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date         (378,390)    
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans Receivable [Member] | Loans [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 11,558,331   11,015,305        
Included in earnings 27,466   32,198        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (672,595)   402,842        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (162,003)   (149,047)        
Balance, end of period 10,751,199   11,301,298 10,751,199 11,301,298    
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (27,466)   (32,198)        
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period         2,622,566 $ 2,622,566  
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    
Balance, end of period             $ 2,622,566
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date         31,454    
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [Member] | Investments Contract [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning of period 2,955,763   2,663,719        
Included in earnings (4,137)   (26,259)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (177,107)   100,783        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (17,595)   (15,927)        
Balance, end of period 2,756,924   2,722,316 $ 2,756,924 $ 2,722,316    
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date $ 4,137   $ 26,259