Summary of Income Statement Information Under The Equity Method Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Method Investment Summarized Financial Information Income Statement [Abstract]
Revenues	$ 107,795	$ 294,408	$ 569,574
Cost of operations	105,465	275,015	529,237
Gross Profit	2,330	19,393	40,337
Net Income (loss)	$ (38,245)	$ (28,773)	$ 1,036