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Long-term debt - Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements	$ (268)	$ (1,815)	$ 782	$ (5,002)
Amount of losses reclassified from accumulated OCI into income	1,537	1,265	3,074	2,529
Tax benefit (expense)
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements	93	1,154	(271)	3,184
Amount of losses reclassified from accumulated OCI into income	(533)	(805)	(1,066)	(1,610)
Interest rate cap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized gains (losses) in OCI on interest rate cap agreements	(361)	(2,969)	1,053	(8,186)
Amount of losses reclassified from accumulated OCI into income	$ 2,070	$ 2,070	$ 4,140	$ 4,139

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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