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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items]
Amount of unrealized losses in OCI on interest rate cap agreements	$ (1,824)	$ (31)	$ (14,842)	$ (611)
Reclassification from accumulated other comprehensive loss into net income	1,623	1,606	3,246	3,212
Related income tax
Derivative Instruments Gain Loss [Line Items]
Amount of unrealized losses in OCI on interest rate cap agreements	607	11	4,935	212
Reclassification from accumulated other comprehensive loss into net income	(540)	(557)	(1,080)	(1,114)
Interest rate cap agreements | Debt Expense
Derivative Instruments Gain Loss [Line Items]
Amount of unrealized losses in OCI on interest rate cap agreements	(2,431)	(42)	(19,777)	(823)
Reclassification from accumulated other comprehensive loss into net income	$ 2,163	$ 2,163	$ 4,326	$ 4,326

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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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