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Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 3,246,012  
Total other comprehensive income $ 1,343 $ 643 3,046 $ 2,038
Ending Balance 3,189,016   3,189,016  
Gains on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     (3,930)  
Other comprehensive income before reclassifications     995  
Change in cash flow hedges reclassed to earnings     712  
Total other comprehensive income     1,707  
Ending Balance (2,223)   (2,223)  
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     (262)  
Other comprehensive income before reclassifications     1,014  
Change in cash flow hedges reclassed to earnings     0  
Total other comprehensive income     1,014  
Ending Balance 752   752  
Total [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     (4,192)  
Other comprehensive income before reclassifications     2,009  
Change in cash flow hedges reclassed to earnings     712  
Total other comprehensive income     2,721  
Ending Balance $ (1,471)   $ (1,471)