Net Income Per Share - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued	45,005,932	45,003,461	45,000,000
Par value of common stock issued	$ 0.01	$ 0.01	$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			5,047,138
Exercise price of common stock			$ 16.67
Investment Warrants Expiration Date	Apr. 30, 2023
Warrant exercised	949	6,312
Common stock shares issued	949	2,524
Warrants outstanding	5,039,877
Successor [Member]
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued			45,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			5,047,138