Stock-Based Compensation - Weighted Average Grant Date of SARs Granted and Total Intrinsic Value of SARs Exercised (Detail) (Stock Appreciation Rights (SARs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares	318	259	215
Weighted average grant-date fair value per SAR	$ 6.08	$ 5.97	$ 7.10
Intrinsic value of SARs exercised	$ 488
Fair value of vested	$ 1,298	$ 1,388	$ 1,198