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Financial Instrument - Risk Management and Fair Value - Summary of Foreign Currency Risk Exposure (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets        
Cash and cash equivalents $ 119,065 $ 158,732 $ 156,158 $ 238,792
Accounts receivable, net 65,689 131,920    
Other assets 22,153 32,087    
Currency risk [member]        
Assets        
Cash and cash equivalents 12,322 22,818    
Accounts receivable, net 27,670 73,018    
Other assets 18,942 15,726    
Total assets 58,934 111,562    
Liabilities        
Accounts payable 20,142 51,313    
Taxes payable 13,757 37,137    
Other liabilities 11,387 18,513    
Total liabilities 45,286 106,963    
Net position $ 13,648 $ 4,599