Quarterly report pursuant to Section 13 or 15(d)

General - Additional Information (Detail)

v3.3.0.814
General - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Revenue, Major Customer [Line Items]          
Payments to Acquire Property, Plant, and Equipment     $ 72,469 $ 151,109  
Percentage accounted for under the equity method 50.00%   50.00%    
Reimbursable Costs $ 20,800 $ 19,300 $ 68,400 $ 57,500  
Deposits in domestic bank 62,100   62,100   $ 59,300
Deposits, Foreign 43,100   $ 43,100   $ 54,400
Proceeds from Divestiture of Interest in Joint Venture $ 900        
Exxon Neftegas Limited [Member]          
Revenue, Major Customer [Line Items]          
Percentage of revenue from major customer     27.00% 18.90%