Derivative Instruments and Hedging Activities - Fair value of the Company's Derivative Financial Instruments Classification on the Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value
Other assets [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	1,548
Other liabilities [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	$ 1,548