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Debt Obligations (Credit Facility - Current Borrowings) - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility $ 305,600  
Amount borrowed under the credit facility 351,341 $ 466,850
Credit facility available for revolving loans or issuing new letters of credit 1,150,000  
Letters Of Credit and Bank Guarantees [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 305,600  
Letters Of Credit and Bank Guarantees [Member] | U S Dollar [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 210,800  
Letters Of Credit and Bank Guarantees [Member] | Primarily Canadian and Australian dollars [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 94,800  
Borrowings Under Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 351,300  
Borrowings Under Credit Facility [Member] | U S Dollar [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 210,000  
Borrowings Under Credit Facility [Member] | Canadian Dollars [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility $ 141,300