Long-Term Debt - Interest Expense (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 15, 2016	Dec. 31, 2017	Dec. 31, 2015
Debt Disclosure [Abstract]
Cash payments	$ 1,312	$ 69,134	$ 30,397	$ 68,105
Commitment and agency fees paid	35	772	924	1,097
Amortization of premium on debt	0	1,086	0	547
Amortization of deferred financing costs	17	3,328	476	3,277
Write-off of deferred financing costs	0	0	0	821
Capitalized interest	0	0	0	0
Net interest expense	$ 1,364	$ 74,320	$ 31,797	$ 73,847