Fair Value Measurements of Financial Assets and Liabilities on Recurring and Non Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Assets:
Impairment of long-lived assets	$ 5,896
Liabilities:
Derivative instruments	(11,155)	$ (3,468)
Total fair value	(5,259)	(3,468)
Fair Value, Inputs, Level 2
Liabilities:
Derivative instruments	(11,155)	(3,468)
Total fair value	(11,155)	$ (3,468)
Fair Value, Inputs, Level 3
Assets:
Impairment of long-lived assets	5,896
Liabilities:
Total fair value	$ 5,896