Other Comprehensive Loss - Changes in Accumulated OCI by Component (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,981,478	$ 2,073,002	$ 2,897,438
Other comprehensive income (loss) before reclassifications	(3,363)	421	(744)
Change in cash flow hedges reclassed to earnings	1,172	469	469
Net current-period other comprehensive income (loss)	(2,191)	890	(275)
Ending Balance	1,944,823	1,981,478	2,073,002
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,172)	(1,641)	(2,100)
Other comprehensive income (loss) before reclassifications	0	0	(10)
Change in cash flow hedges reclassed to earnings	1,172	469	469
Net current-period other comprehensive income (loss)	1,172	469	459
Ending Balance	0	(1,172)	(1,641)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	681	260	994
Other comprehensive income (loss) before reclassifications	(3,363)	421	(734)
Change in cash flow hedges reclassed to earnings	0	0	0
Net current-period other comprehensive income (loss)	(3,363)	421	(734)
Ending Balance	(2,682)	681	260
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(491)	(1,381)	(1,106)
Ending Balance	$ (2,682)	$ (491)	$ (1,381)