Accumulated other comprehensive (loss) income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 2,319,242
Ending balance	$ 1,753,340		1,753,340
Interest rate cap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(13,029)	$ (6,360)	(1,433)	$ (8,961)
Unrealized (losses) gains	(2,169)	(1,420)	(21,946)	(2,244)
Related income tax benefit	541	360	5,476	572
Unrealized (losses) gains net	(1,628)	(1,060)	(16,470)	(1,672)
Reclassification into net income	1,378	2,101	5,704	6,428
Related income	(344)	(532)	(1,424)	(1,646)
Reclassification from accumulated other comprehensive income into net income net of tax	1,034	1,569	4,280	4,782
Ending balance	(13,623)	(5,851)	(13,623)	(5,851)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(122,078)	(27,251)	(46,065)	(25,963)
Unrealized (losses) gains	13,171	(44,502)	(62,842)	(45,790)
Related income tax benefit	0	0	0	0
Unrealized (losses) gains net	13,171	(44,502)	(62,842)	(45,790)
Reclassification into net income	0	0	0	0
Related income	0	0	0	0
Reclassification from accumulated other comprehensive income into net income net of tax	0	0	0	0
Ending balance	(108,907)	(71,753)	(108,907)	(71,753)
Accumulated other comprehensive (loss) income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(135,107)	(33,611)	(47,498)	(34,924)
Unrealized (losses) gains	11,002	(45,922)	(84,788)	(48,034)
Related income tax benefit	541	360	5,476	572
Unrealized (losses) gains net	11,543	(45,562)	(79,312)	(47,462)
Reclassification into net income	1,378	2,101	5,704	6,428
Related income	(344)	(532)	(1,424)	(1,646)
Reclassification from accumulated other comprehensive income into net income net of tax	1,034	1,569	4,280	4,782
Ending balance	$ (122,530)	$ (77,604)	$ (122,530)	$ (77,604)