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Subsequent Events - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Nov. 03, 2014
Subsequent Event [Member]
Nov. 03, 2014
Subsequent Event [Member]
Nov. 03, 2014
Subsequent Event [Member]
Emtrol LLC [Member]
Nov. 04, 2014
Subsequent Event [Member]
Zhongli Industrial Technology Company Ltd [Member]
Subsequent Event [Line Items]            
Membership interest acquired         100.00%  
Consideration paid in cash for acquisition     $ 32,000,000      
Shares issued for acquired subsidiary     454,000      
Value of shares issued to subsidiary       6,000,000    
Annual revenue of subsidiary $ 65,062,000 $ 195,419,000       $ 28,000,000