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Financial Instrument - Risk Management and Fair Value - Summary of Foreign Currency Risk Exposure (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Cash and cash equivalents $ 238,792 $ 331,687 $ 204,715 $ 221,443
Accounts receivable, net 118,085 116,100    
Prepaid expenses 71,551 84,805    
Other assets 42,841 34,715    
Currency risk [member]        
ASSETS        
Cash and cash equivalents 25,189 51,718    
Investments 277 276    
Accounts receivable, net 75,769 69,460    
Prepaid expenses 32,045 34,635    
Other assets 29,459 35,343    
Total assets 162,739 191,432    
Liabilities        
Accounts payable 37,186 32,098    
Taxes payable 39,559 55,060    
Other liabilities 25,471 40,342    
Total liabilities 102,216 127,500    
Net position $ 60,523 $ 63,932