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Comprehensive income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 01, 2018	Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 4,886,066
Ending balance	$ 4,484,507		4,484,507
Interest rate cap and swap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12,527)	$ (13,952)	(12,408)	$ (12,029)
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 0	$ (2,706)
Unrealized gains (losses)	(361)	(2,969)	1,053	(8,186)
Related income tax (expense) benefit	93	1,154	(271)	3,184
Unrealized (losses) gains net	(268)	(1,815)	782	(5,002)
Reclassification from accumulated other comprehensive income into net income	2,070	2,070	4,140	4,139
Related income tax (expense) benefit	(533)	(805)	(1,066)	(1,610)
Reclassification from accumulated other comprehensive income into net income net of tax	1,537	1,265	3,074	2,529
Ending balance	(11,258)	(14,502)	(11,258)	(14,502)
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		3,594	5,662	2,175
Cumulative Effect of New Accounting Principle in Period of Adoption						(5,662)
Unrealized gains (losses)		1,446	0	3,428
Related income tax (expense) benefit		(389)	0	(812)
Unrealized (losses) gains net		1,057	0	2,616
Reclassification from accumulated other comprehensive income into net income		(117)	0	(346)
Related income tax (expense) benefit		46	0	135
Reclassification from accumulated other comprehensive income into net income net of tax		(71)	0	(211)
Ending balance	0	4,580	0	4,580
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	39,862	(66,528)	19,981	(79,789)
Cumulative Effect of New Accounting Principle in Period of Adoption					0	0
Unrealized gains (losses)	(50,529)	49,142	(30,648)	62,403
Related income tax (expense) benefit	0	0	0	0
Unrealized (losses) gains net	(50,529)	49,142	(30,648)	62,403
Reclassification from accumulated other comprehensive income into net income	0	0	0	0
Related income tax (expense) benefit	0	0	0	0
Reclassification from accumulated other comprehensive income into net income net of tax	0	0	0	0
Ending balance	(10,667)	(17,386)	(10,667)	(17,386)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	27,335	(76,886)	13,235	(89,643)
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 0	$ (8,368)
Unrealized gains (losses)	(50,890)	47,619	(29,595)	57,645
Related income tax (expense) benefit	93	765	(271)	2,372
Unrealized (losses) gains net	(50,797)	48,384	(29,866)	60,017
Reclassification from accumulated other comprehensive income into net income	2,070	1,953	4,140	3,793
Related income tax (expense) benefit	(533)	(759)	(1,066)	(1,475)
Reclassification from accumulated other comprehensive income into net income net of tax	1,537	1,194	3,074	2,318
Ending balance	$ (21,925)	$ (27,308)	$ (21,925)	$ (27,308)

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