Long-term debt - Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized losses in OCI on interest rate cap agreements	$ (13,018)	$ (580)
Reclassification from accumulated other comprehensive loss into net income	1,623	1,606
Related income tax
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized losses in OCI on interest rate cap agreements	4,328	201
Reclassification from accumulated other comprehensive loss into net income	(540)	(557)
Interest rate cap agreements | Debt Expense
Derivative Instruments Gain Loss [Line Items]
Amount of unrecognized losses in OCI on interest rate cap agreements	(17,346)	(781)
Reclassification from accumulated other comprehensive loss into net income	$ 2,163	$ 2,163