Net Income Per Share - Additional Information (Detail) - Antidilutive Securities, Name [Domain] - Scenario, Unspecified [Domain] - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued	45,006,139		45,005,932	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	398	51
Common stock shares issued	207	51
Warrants outstanding	5,039,479