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Net Income Per Share - Additional Information (Detail) - $ / shares	Mar. 31, 2019	Dec. 31, 2018	May 01, 2013	Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items]
Common stock, shares outstanding	45,520,541	45,336,278
Number of new common stock issued	45,560,960	45,365,170
Par value of common stock issued	$ 0.01	$ 0.01		$ 0.01
Exercise price of common stock			$ 16.67
Warrants outstanding	4,877,783

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