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Summary of Gain or Loss Recognized and Amounts and Location of Income or Expense and Gain or Loss Reclassified into Income for Interest Rate Contracts and Foreign Currency Contracts (Detail) (Interest rate agreements, Interest Expense, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest rate agreements \| Interest Expense
Derivative [Line Items]
Loss Recognized in Other Comprehensive Income	$ 0	$ 0	$ 0
Income (Expense) and Gain (Loss) Reclassified into Income	$ (7,223)	$ (7,430)	$ (7,637)