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Basis of Presentation and Significant Accounting Policies - Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity $ 617,768 $ 404,112 $ 235,701 $ 285,757
Currency translation adjustments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity 24,454 8,769    
Net unrealized (loss) gain on derivative financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity (496)      
Net unrealized (loss) gain on derivative financial instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity   64    
Unrecognized prior service cost on benefit obligations        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity (15,902) (16,614)    
Net unrealized gain on available-for-sale investments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity 142 333    
Accumulated other comprehensive income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives        
Stockholders' Equity $ 8,198 $ (7,448) $ (10,289) $ 9,454