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Net Income Per Share - Additional Information (Detail) - $ / shares | Mar. 31, 2019 | Dec. 31, 2018 | May 01, 2013 | Apr. 30, 2013
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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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