Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives not designated as hedging instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 8,861	$ 10,080
Other liabilities [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	8,861	10,080
Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	8,861	10,080
Other assets [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 8,861	$ 10,080