Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Parenthetical) (Detail) - Successor [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Unrealized gains (losses) on securities, net of deferred income taxes	$ 0	$ 0	$ 0
Gain (loss) on foreign currency translation, net of deferred income taxes	$ 0	$ 0	$ 0