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INVESTMENT OPERATIONS - Additional Information (Details)
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 11 Months Ended
Jan. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
position
subsidiary
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
position
subsidiary
Dec. 31, 2015
USD ($)
subsidiary
Successor            
Investment [Line Items]            
Other-than-temporary impairments of investments recorded   $ 1,898,000 $ 14,906,000 $ 28,301,000 $ 10,194,000  
Other-than-temporary impairments of investments recorded in other comprehensive income (loss)   (1,410,000) 4,842,000 12,503,000 3,302,000  
Gross unrealized loss greater than twelve months   $ 733,640,000     $ 733,640,000 $ 0
Total positions that were in an unrealized loss position | position   1,231     1,231  
Available-for-sale securities, fair value   $ 37,726,687,000     $ 37,726,687,000 33,847,196,000
Available-for-sale securities, amortized cost   37,857,433,000     37,857,433,000 36,724,217,000
Other-than-temporary impairments on held-to-maturity securities   0 0 0 0  
Held-to-maturity securities, unrecognized holding losses           78,300,000
Predecessor            
Investment [Line Items]            
Other-than-temporary impairments of investments recorded $ 636,000          
Other-than-temporary impairments of investments recorded in other comprehensive income (loss) 155,000          
Other-than-temporary impairments on held-to-maturity securities 0          
Fixed maturities | Successor            
Investment [Line Items]            
Trading securities   2,800,000,000     2,800,000,000 2,700,000,000
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell   0 $ 0 $ 0 0  
Available-for-sale securities, fair value   36,841,646,000     36,841,646,000 32,909,201,000
Available-for-sale securities, amortized cost   36,991,091,000     36,991,091,000 35,793,000,000
Gross unrealized gains   121,136,000     121,136,000 0
Gross unrealized losses   1,751,000     1,751,000 78,314,000
Fixed maturities | Predecessor            
Investment [Line Items]            
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell $ 0          
Equity securities | Successor            
Investment [Line Items]            
Trading securities   7,300,000     7,300,000 8,300,000
Gross unrealized loss greater than twelve months   5,766,000     5,766,000 0
Available-for-sale securities, fair value   730,025,000     730,025,000 731,004,000
Available-for-sale securities, amortized cost   711,326,000     711,326,000 724,226,000
Short-term investments | Successor            
Investment [Line Items]            
Trading securities   25,700,000     25,700,000 61,700,000
Available-for-sale securities, fair value   155,016,000     155,016,000 206,991,000
Available-for-sale securities, amortized cost   155,016,000     155,016,000 206,991,000
Residential mortgage-backed securities | Successor            
Investment [Line Items]            
Gross unrealized loss greater than twelve months   4,125,000     4,125,000 0
Available-for-sale securities, fair value   1,896,404,000     1,896,404,000 1,765,273,000
Available-for-sale securities, amortized cost   1,851,507,000     1,851,507,000 1,773,099,000
Commercial mortgage-backed securities | Successor            
Investment [Line Items]            
Gross unrealized loss greater than twelve months   1,470,000     1,470,000 0
Available-for-sale securities, fair value   1,713,607,000     1,713,607,000 1,286,887,000
Available-for-sale securities, amortized cost   1,684,149,000     1,684,149,000 1,328,317,000
Other asset-backed securities | Successor            
Investment [Line Items]            
Gross unrealized loss greater than twelve months   15,423,000     $ 15,423,000 0
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program (FFELP), minimum         97.00%  
Available-for-sale securities, fair value   1,201,916,000     $ 1,201,916,000 797,051,000
Available-for-sale securities, amortized cost   1,202,982,000     1,202,982,000 813,056,000
States, municipals, and political subdivisions | Successor            
Investment [Line Items]            
Gross unrealized loss greater than twelve months   20,487,000     20,487,000 0
Available-for-sale securities, fair value   1,727,261,000     1,727,261,000 1,603,600,000
Available-for-sale securities, amortized cost   1,725,351,000     1,725,351,000 1,729,732,000
Corporate securities | Successor            
Investment [Line Items]            
Gross unrealized loss greater than twelve months   684,682,000     684,682,000 0
Available-for-sale securities, fair value   28,878,973,000     28,878,973,000 25,843,786,000
Available-for-sale securities, amortized cost   29,114,514,000     29,114,514,000 $ 28,499,691,000
Below investment grade | Successor            
Investment [Line Items]            
Trading securities   266,400,000     266,400,000  
Available-for-sale securities, fair value   1,900,000,000     1,900,000,000  
Available-for-sale securities, amortized cost   2,000,000,000     2,000,000,000  
Securities not publicly traded   360,100,000     $ 360,100,000  
Red Mountain            
Investment [Line Items]            
Number of wholly owned subsidiaries that were determined to be VIEs | subsidiary           1
Ownership through an affiliate (as a percent)         100.00%  
Risk of loss related to the VIE limited to the entity's investment   10,000     $ 10,000  
Red Mountain | Successor            
Investment [Line Items]            
Payments made         $ 0  
Steel City            
Investment [Line Items]            
Ownership through an affiliate (as a percent)         100.00%  
Risk of loss related to the VIE limited to the entity's investment   $ 10,000     $ 10,000  
Steel City | Successor            
Investment [Line Items]            
Payments made         $ 0  
Red Mountain and Steel City            
Investment [Line Items]            
Number of wholly owned subsidiaries that were determined to be VIEs | subsidiary   2     2