Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2013
Deferred tax assets:
AMT Credits			$ 60,000,000
Successor [Member]
Deferred tax liabilities:
Insurance intangible	$ 424,239,000	$ 493,822,000
Variable interest entities	10,053,000	14,149,000
Investments	66,278,000	136,017,000
Unearned premiums and credit fees	98,945,000	104,589,000
Other	34,025,000	33,835,000
Deferred Tax Liabilities, Gross, Noncurrent	633,540,000	782,412,000
Total deferred tax liabilities	(2,205,000)	(2,079,000)
Deferred tax assets:
Net operating loss and capital carryforward	1,504,569,000	1,890,551,000
Loss reserves	122,635,000	185,881,000
Compensation	2,839,000	2,004,000
AMT Credits	27,252,000	10,359,000
Other	9,913,000	9,539,000
Sub total deferred tax assets	1,667,208,000	2,098,334,000
Valuation allowance	1,035,873,000	1,318,001,000
Total deferred tax assets	$ 631,335,000	$ 780,333,000