Financial Instruments - Summary of Effects of Interest Rate Swap (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivatives, Fair Value [Line Items]
Gain Recognized in AOCL, net of tax	$ 61	$ 78	$ 117	$ 143
Interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Gain Recognized in AOCL, net of tax	61	78	117	143
Loss Reclassified from AOCL into Expense	$ 109	$ 114	$ 226	$ 225