Long-Term Debt - Schedule of Interest Expense Related to Long-Term Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Expense, Debt [Abstract]
Contractual interest	$ 10,740	$ 10,424	$ 7,315
Non-cash expense	7,487	6,404	3,529
Capitalized interest	(131)	(61)
Total	$ 18,096	$ 16,767	$ 10,844