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Restructuring Charge - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 4,001,000 $ 1,989,000 $ 1,786,000
Compania Espanole De Petroles [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0 2,000,000 $ 1,800,000
Restructuring charge outstanding 700,000 $ 1,600,000  
Restructuring Related to Alexander Spirit [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4,000,000    
Restructuring charge outstanding $ 1,100,000