Other Comprehensive Loss - Changes in Accumulated OCI by Component (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 2,073,002	$ 2,897,438	$ 3,246,012
Other comprehensive income (loss) before reclassifications	421	(744)	2,258
Change in cash flow hedges reclassed to earnings	469	469	828
Net current-period other comprehensive income (loss)	890	(275)	3,086
Ending Balance	1,981,478	2,073,002	2,897,438
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,641)	(2,100)	(3,930)
Other comprehensive income (loss) before reclassifications	0	(10)	1,002
Change in cash flow hedges reclassed to earnings	469	469	828
Net current-period other comprehensive income (loss)	469	459	1,830
Ending Balance	(1,172)	(1,641)	(2,100)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	260	994	(262)
Other comprehensive income (loss) before reclassifications	421	(734)	1,256
Change in cash flow hedges reclassed to earnings	0	0	0
Net current-period other comprehensive income (loss)	421	(734)	1,256
Ending Balance	681	260	994
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,381)	(1,106)	(4,192)
Ending Balance	$ (491)	$ (1,381)	$ (1,106)