Acquisitions (Zhongli) - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 15, 2014	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Adjustments to fair value of earn-out payable		$ 11,222,000
Zhongli [Member]
Business Acquisition [Line Items]
Equity interests acquired	100.00%
Consideration paid in cash for acquisition	$ 7,000,000
Earn out expenses	0	11,200,000
Adjustments to fair value of earn-out payable	$ 17,100,000	27,000,000
First year estimated earn-out payable		11,700,000	$ 6,100,000
Remainder of estimated earn-out payable		15,300,000	11,000,000
Revenue from acquired entity		28,200,000	100,000
Income (loss) from acquired entity		$ (6,000,000)	$ 0