Summary of Significant Accounting Policies - Additional Information 4 (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operations And Summary Of Significant Accounting Policies [Line Items]
Performance multiplier, minimum	0.00%
Performance multiplier, maximum	200.00%
Participating securities that share in losses	0
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding	411,545
Predecessor
Operations And Summary Of Significant Accounting Policies [Line Items]
Participating securities that share in losses		0
Interest paid in-kind		$ 9,845
Predecessor | Convertible Notes
Operations And Summary Of Significant Accounting Policies [Line Items]
Interest paid in-kind		$ 9,800
Predecessor | Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding		911,319