Derivative Financial Instruments - Schedule of Effect of Derivative Instruments on Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
November 2007 Swap Transaction [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)		$ (77)
November 2007 Swap Transaction [Member] | Interest expense, net [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(228)
July 2012 Swap Transaction [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	105	864
July 2012 Swap Transaction [Member] | Interest expense, net [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	625
June 2013 Swap Transaction [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)		$ 569