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Effects of Interest Rate Swap and Cap Agreements (Detail) - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	$ (12,241)	$ (10,059)	$ 169
Amount of gain (losses) reclassified from accumulated OCI into income	3,111	10,608	12,889
Tax benefit (expense)
Derivative Instruments Gain Loss [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	7,844	6,450	(108)
Amount of gain (losses) reclassified from accumulated OCI into income	(1,992)	(6,801)	(8,207)
Interest rate swap agreements
Derivative Instruments Gain Loss [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	(3,971)	(8,390)	1,251
Interest rate swap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of gain (losses) reclassified from accumulated OCI into income	2,664	12,279	15,678
Interest rate cap agreements
Derivative Instruments Gain Loss [Line Items]
Amount of gains (losses) recognized in OCI on interest rate swap and cap agreements	(16,114)	(8,119)	(974)
Interest rate cap agreements | Debt Expense (Including Refinancing Charges)
Derivative Instruments Gain Loss [Line Items]
Amount of gain (losses) reclassified from accumulated OCI into income	$ 2,439	$ 5,130	$ 5,418

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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=56946850&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=56946850&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=56946850&loc=SL5624171-113959

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