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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, U_pure in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) shares
Stockholders Equity Note [Line Items] |  |  |  |
Shares repurchased during period, shares | 0 | 0 | 0 | 0
Dividends declared | $ | $ 0 | $ 0 | $ 0 | $ 0
New creditors Warrant Issued |  | 11,543,814 | 2,220,857 |
Warrant exercisable conversion ratio |  |  | 1,100 |
September 2010 Senior Unsecured Notes |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Remaining other comprehensive loss related to interest rate, swap after-tax | $ |  |  |  | 1,300,000
Remaining other comprehensive loss related to interest rate, swap pre-tax | $ |  |  |  | $ 2,400,000
Creditor Warrants |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Nominal exercise price of warrants | $ / shares |  |  | $ 0.01 |
Stock issued during period, Value | $ |  |  | $ 2,300,000 |
Stock issued during period, shares, acquisitions |  |  | 2,189,709 |
Equity Warrants |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Nominal exercise price of warrants | $ / shares |  |  | $ 100 |
Stock issued during period, Value | $ |  |  | $ 800,000 |
Stock issued during period, shares, acquisitions |  |  | 0 |
Series A Warrants |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
New creditors Warrant Issued |  | 2,432,432 | 0 |
Nominal exercise price of warrants | $ / shares |  | $ 57,060,000 |  |
Series B Warrants |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
New creditors Warrant Issued |  | 2,629,657 | 0 |
Nominal exercise price of warrants | $ / shares |  | $ 62,280,000 |  |

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