Derivative Instruments and Hedging Activities - Fair Value of the Company's Derivative Financial Instruments Classification on Unaudited Condensed Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 2,096
Other Assets [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	2,096
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value
Other Liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value