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Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 2,897,438  
Total other comprehensive (loss) income $ (201) $ 898 (480) $ 1,703
Ending Balance 2,692,338   2,692,338  
Gains and Losses on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     (2,100)  
Other comprehensive loss before reclassifications     (1)  
Change in cash flow hedges reclassed to earnings     234  
Total other comprehensive (loss) income     233  
Ending Balance (1,867)   (1,867)  
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     994  
Other comprehensive loss before reclassifications     (584)  
Change in cash flow hedges reclassed to earnings     0  
Total other comprehensive (loss) income     (584)  
Ending Balance 410   410  
Total [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     (1,106)  
Other comprehensive loss before reclassifications     (585)  
Change in cash flow hedges reclassed to earnings     234  
Total other comprehensive (loss) income     (351)  
Ending Balance $ (1,457)   $ (1,457)