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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 4 Months Ended | 12 Months Ended | 30 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Nov. 02, 2016 | Jun. 30, 2015 | May 01, 2013
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Number of new common stock issued | 45,000,000 |  |  |  |  |  |  |
Par value of common stock issued | $ 0.01 |  |  |  |  |  |  |
Exercise price of common stock | $ 16.67 |  |  |  |  |  |  |
Investment Warrants Expiration Date | Apr. 30, 2023 |  |  |  |  |  |  |
Warrants Repurchased Average Cost per Warrant |  |  |  |  | $ 8.21 |  |  |
RemainingWarrantBuyBackAuthorizedDollars |  | $ 11,939 |  |  | $ 11,939 |  |  |
Successor [Member] |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Number of new common stock issued |  |  |  |  |  |  |  | 45,000,000
Par value of common stock issued |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  | $ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 5,047,138 |  |  |  |  |  |  | 5,047,138
Exercise price of common stock |  |  |  |  |  |  |  | $ 16.67
Warrant exercised |  | 0 | 136 | 740 |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 0 | 136 | 236 |  |  |  |
First Warrant Buyback Authorization Dollars |  |  |  |  |  |  | $ 10,000 |
Warrants outstanding |  | 4,053,670 |  |  | 4,053,670 |  |  |
Warrants Purchased During Period Shares |  |  |  |  | 985,331 |  |  |
Payments for Repurchase of Warrants |  | $ 0 | $ 2,717 | $ 5,375 | $ 8,092 |  |  |
SecondWarrantBuyBackAuthorizedDollars |  |  |  |  |  | $ 10,000 |  |
Warrants Purchased During Period Shares |  | 0 |  |  |  |  |  |
Warrants Purchased During Period Dollars |  | $ 0 |  |  |  |  |  |

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