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Acquisitions (Zhongli) - Additional Information (Detail) - Zhongli [Member] - USD ($)
9 Months Ended
Dec. 15, 2014
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Equity interests acquired 100.00%    
Consideration paid in cash for acquisition $ 7,000,000    
Earn out expenses 0 $ 26,200,000  
Adjustments to fair value of earn-out payable $ 17,100,000 9,100,000  
First year estimated earn-out payable   11,600,000 $ 11,600,000
Remainder of estimated earn-out payable   14,600,000 $ 14,600,000
Revenue from acquired entity   24,300,000  
Net income (loss) from acquired entity   $ (6,800,000)