Accumulated other comprehensive (loss) income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 01, 2018	Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 3,908,398
Ending balance	$ 2,512,523		2,512,523
Interest rate cap and swap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(6,360)	$ (11,258)	(8,961)	$ (12,408)
Cumulative effect of change in accounting principle					$ 0	$ (2,706)
Unrealized (losses) gains	(1,420)	50	(2,244)	1,103
Related income tax benefit	360	(13)	572	(284)
Unrealized (losses) gains net	(1,060)	37	(1,672)	819
Reclassification into net income	2,101	2,163	6,428	6,303
Related income	(532)	(557)	(1,646)	(1,623)
Reclassification from accumulated other comprehensive income into net income net of tax	1,569	1,606	4,782	4,680
Ending balance	(5,851)	(9,615)	(5,851)	(9,615)
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance				5,662
Cumulative effect of change in accounting principle						(5,662)
Unrealized (losses) gains				0
Related income tax benefit				0
Unrealized (losses) gains net				0
Reclassification into net income				0
Related income				0
Reclassification from accumulated other comprehensive income into net income net of tax				0
Ending balance		0		0
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(27,251)	(10,667)	(25,963)	19,981
Cumulative effect of change in accounting principle					0	0
Unrealized (losses) gains	(44,502)	(8,827)	(45,790)	(39,475)
Related income tax benefit	0	0	0	0
Unrealized (losses) gains net	(44,502)	(8,827)	(45,790)	(39,475)
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	(71,753)	(19,494)	(71,753)	(19,494)
Accumulated other comprehensive (loss) income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(33,611)	(21,925)	(34,924)	13,235
Cumulative effect of change in accounting principle					$ 0	$ (8,368)
Unrealized (losses) gains	(45,922)	(8,777)	(48,034)	(38,372)
Related income tax benefit	360	(13)	572	(284)
Unrealized (losses) gains net	(45,562)	(8,790)	(47,462)	(38,656)
Reclassification into net income	2,101	2,163	6,428	6,303
Related income	(532)	(557)	(1,646)	(1,623)
Reclassification from accumulated other comprehensive income into net income net of tax	1,569	1,606	4,782	4,680
Ending balance	$ (77,604)	$ (29,109)	$ (77,604)	$ (29,109)