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Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Total Interest Expense	$ (23,875)	$ (23,350)	$ (70,844)	$ (63,560)
Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Net interest expense on cash flows hedges	(1,466)	(1,487)	(4,425)	(4,465)
Realized expense due to ineffective portion of cash flow hedges	0	0	0	0
Realized net losses reclassified from other comprehensive income	(19)	(32)	(77)	(131)
Total Interest Expense	$ (1,485)	$ (1,519)	$ (4,502)	$ (4,596)

X

- Definition

Amount of interest expense recognized in earnings on cash flow hedge.

+ References

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- Definition

The effective portion of 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



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

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Amount of the cost of borrowed funds accounted for as interest expense.

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