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Comprehensive income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 4,849,741
Ending balance	$ 4,969,129		4,969,129
Interest rate cap and swap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(14,502)	$ (18,097)	(12,029)	$ (10,925)
Unrealized (losses) gains	(782)	(255)	(8,967)	(13,489)
Related income tax benefit (expense)	304	102	3,488	5,251
Unrealized (losses) gains net	(478)	(153)	(5,479)	(8,238)
Reclassification from accumulated other comprehensive income into net income	2,070	634	6,208	2,128
Related income tax (expense) benefit	(805)	(246)	(2,415)	(827)
Reclassification from accumulated other comprehensive income into net income net of tax	1,265	388	3,793	1,301
Ending balance	(13,715)	(17,862)	(13,715)	(17,862)
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	4,580	1,986	2,175	1,361
Unrealized (losses) gains	1,253	1,454	4,682	2,578
Related income tax benefit (expense)	(390)	(391)	(1,202)	(797)
Unrealized (losses) gains net	863	1,063	3,480	1,781
Reclassification from accumulated other comprehensive income into net income	(15)	(81)	(362)	(233)
Related income tax (expense) benefit	6	31	141	90
Reclassification from accumulated other comprehensive income into net income net of tax	(9)	(50)	(221)	(143)
Ending balance	5,434	2,999	5,434	2,999
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(17,386)	(43,925)	(79,789)	(50,262)
Unrealized (losses) gains	29,143	(951)	91,546	5,386
Related income tax benefit (expense)	0	0	0	0
Unrealized (losses) gains net	29,143	(951)	91,546	5,386
Reclassification from accumulated other comprehensive income into net income	0	7,513	0	7,513
Related income tax (expense) benefit	0	0	0	0
Reclassification from accumulated other comprehensive income into net income net of tax	0	7,513	0	7,513
Ending balance	11,757	(37,363)	11,757	(37,363)
Accumulated other comprehensive (loss) income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(27,308)	(60,036)	(89,643)	(59,826)
Unrealized (losses) gains	29,614	248	87,261	(5,525)
Related income tax benefit (expense)	(86)	(289)	2,286	4,454
Unrealized (losses) gains net	29,528	(41)	89,547	(1,071)
Reclassification from accumulated other comprehensive income into net income	2,055	8,066	5,846	9,408
Related income tax (expense) benefit	(799)	(215)	(2,274)	(737)
Reclassification from accumulated other comprehensive income into net income net of tax	1,256	7,851	3,572	8,671
Ending balance	$ 3,476	$ (52,226)	$ 3,476	$ (52,226)

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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