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Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments Gain Loss [Line Items]
Amount of (losses) gains recognized in OCI on interest rate swap and cap agreements	$ (2,616)	$ (2,453)	$ (8,085)	$ (8,213)
Amount of (losses) gains reclassified from accumulated OCI into income	(448)	(789)	(913)	(1,601)
Tax benefit
Derivative Instruments Gain Loss [Line Items]
Amount of (losses) gains recognized in OCI on interest rate swap and cap agreements	1,667	1,572	5,149	5,263
Amount of (losses) gains reclassified from accumulated OCI into income	285	505	581	1,025
Interest rate swap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of (losses) gains recognized in OCI on interest rate swap and cap agreements	(168)	(976)	(860)	(3,670)
Amount of (losses) gains reclassified from accumulated OCI into income	(123)	(684)	(274)	(1,406)
Interest rate cap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of (losses) gains recognized in OCI on interest rate swap and cap agreements	(4,115)	(3,049)	(12,374)	(9,806)
Amount of (losses) gains reclassified from accumulated OCI into income	$ (610)	$ (610)	$ (1,220)	$ (1,220)

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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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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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