Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - Successor [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Net of Valuation Allowance	$ 256,707	$ 523,664
Deferred tax assets:
Net operating loss and capital carryforward	775,917	1,409,565
Loss reserves	236,237	224,553
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	5,585	4,759
Deferred Tax Assets, Tax Credit Carryforwards	0	31,532
Other	2,140	11,967
Sub total deferred tax assets	1,019,879	1,682,376
Valuation allowance	763,172	1,158,712
Total deferred tax assets	(33,659)	(1,720)
Insurance intangible	177,864	336,728
Variable interest entities	22,817	46,343
Investments	28,798	38,656
Unearned premiums and credit fees	51,485	68,682
Undistributed Earnings of Foreign Subsidiaries	0	30,699
Other	9,402	4,276
Deferred Tax Liabilities, Gross, Noncurrent	$ 290,366	$ 525,384