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Acquisitions (Zhongli) - Additional Information (Detail) - Zhongli [Member] - USD ($)
 6 Months Ended
Dec. 15, 2014
Jun. 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 payment upon attainment of specified financial targets through December 31, 2017 0    
Earn out expenses $ 17,100,000 $ 4,500,000  
First year estimated earn-out payable   9,500,000 $ 9,500,000
Remainder of estimated earn-out payable   12,100,000 $ 12,100,000
Total earn-out payable   $ 21,600,000