Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 2,073,002
Other comprehensive income before reclassifications	378
Change in cash flow hedges reclassed to earnings	234
Net current-period other comprehensive income	612
Balance	2,027,251
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,641)
Other comprehensive income before reclassifications	0
Change in cash flow hedges reclassed to earnings	234
Net current-period other comprehensive income	234
Balance	(1,407)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	260
Other comprehensive income before reclassifications	378
Change in cash flow hedges reclassed to earnings	0
Net current-period other comprehensive income	378
Balance	638
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,381)
Balance	$ (769)