Summary of Treasury Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule of Treasury Stock [Line Items]
Beginning Balance, Shares	3,553,085		3,391,592
Restricted stock forfeitures	22,653	[1]	14,423	[1]
Restricted stock withholdings	119,197	[2]	147,070	[2]
Ending Balance, Shares	3,694,935		3,553,085		3,391,592
Beginning Balance, Cost	$ 48,482		$ 45,219
Restricted stock forfeitures		[1]		[1]
Restricted stock withholdings	3,464	[2]	3,263	[2]	494
Ending Balance, Cost	$ 51,946		$ 48,482		$ 45,219

[1] The Company repurchased forfeited and canceled restricted shares at a cost of $0.001 per share in accordance with the Company's Amended and Restated 2006 Long Term Incentive Plan.

[2] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock. The Company determined the number of shares to be withheld based upon market values that ranged from $ $22.40 to $30.23 per share.