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Comprehensive income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 4,886,066
Ending balance	4,782,081
Interest rate cap and swap agreements
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12,408)	$ (12,029)
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (2,706)	$ 0
Unrealized gains (losses)	1,414	(5,217)
Related income tax (expense) benefit	(364)	2,029
Unrealized (losses) gains net	1,050	(3,188)
Reclassification from accumulated other comprehensive income into net income	2,070	2,070
Related income tax (expense) benefit	(533)	(805)
Reclassification from accumulated other comprehensive income into net income net of tax	1,537	1,265
Ending balance	(12,527)	(13,952)
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5,662	2,175
Cumulative Effect of New Accounting Principle in Period of Adoption			(5,662)	0
Unrealized gains (losses)	0	2,113
Related income tax (expense) benefit	0	(554)
Unrealized (losses) gains net	0	1,559
Reclassification from accumulated other comprehensive income into net income	0	(229)
Related income tax (expense) benefit	0	89
Reclassification from accumulated other comprehensive income into net income net of tax	0	(140)
Ending balance	0	3,594
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	19,981	(79,789)
Cumulative Effect of New Accounting Principle in Period of Adoption			0	0
Unrealized gains (losses)	19,881	13,261
Related income tax (expense) benefit	0	0
Unrealized (losses) gains net	19,881	13,261
Reclassification from accumulated other comprehensive income into net income	0	0
Related income tax (expense) benefit	0	0
Reclassification from accumulated other comprehensive income into net income net of tax	0	0
Ending balance	39,862	(66,528)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	13,235	(89,643)
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (8,368)	$ 0
Unrealized gains (losses)	21,295	10,157
Related income tax (expense) benefit	(364)	1,475
Unrealized (losses) gains net	20,931	11,632
Reclassification from accumulated other comprehensive income into net income	2,070	1,841
Related income tax (expense) benefit	(533)	(716)
Reclassification from accumulated other comprehensive income into net income net of tax	1,537	1,125
Ending balance	$ 27,335	$ (76,886)

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