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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments Gain Loss [Line Items]
Amount of losses recognized in OCI on interest rate cap and swap agreements	$ (478)	$ (153)	$ (5,479)	$ (8,238)
Amount of losses reclassified from accumulated OCI into income	1,265	388	3,793	1,301
Tax benefit
Derivative Instruments Gain Loss [Line Items]
Amount of losses recognized in OCI on interest rate cap and swap agreements	304	102	3,488	5,251
Amount of losses reclassified from accumulated OCI into income	(805)	(246)	(2,415)	(827)
Interest rate swap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of losses recognized in OCI on interest rate cap and swap agreements	0	45	0	(815)
Amount of losses reclassified from accumulated OCI into income	0	25	0	299
Interest rate cap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of losses recognized in OCI on interest rate cap and swap agreements	(782)	(300)	(8,967)	(12,674)
Amount of losses reclassified from accumulated OCI into income	$ 2,070	$ 609	$ 6,208	$ 1,829

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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