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Advance from Customers - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Advance from customers $ 19,693 $ 17,690
Mountain Creek Project    
Advance from customers 14,291 14,291
Sukagawa Project    
Advance from customers 2,494 0
Other Projects    
Advance from customers $ 2,908 $ 3,399