Equity Compensation Plans (Summary of Option Activity) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Shares Outstanding, Beginning balance	847,000
Shares granted	75,000	146,500	177,500
Shares Exercised	(158,000)	129,675	35,874
Shares Forfeited/Cancelled	(6,000)
Shares Outstanding, Ending balance	758,000	847,000
Shares Options exercisable	491,000
Shares Expected to vest	259,000
Weighted-Average Exercise Price Outstanding, Beginning balance	$ 9.59
Weighted-Average Exercise Price Granted	$ 16.61
Weighted-Average Exercise Price Exercised	$ 9.45
Weighted-Average Exercise Price Forfeited/Cancelled	$ 8.21
Weighted-Average Exercise Price Outstanding, Ending balance	$ 10.32	$ 9.59
Weighted-Average Exercise Price Options exercisable	$ 9.05
Weighted-Average Exercise Price Expeceted to vest	$ 12.72
Weighted average remaining contractual term	6 years 3 months 18 days
Weighted Average Remaing Contractual Term Options exercisable	4 years 10 months 24 days
Weighted Average Remaining Contractual Term Expected to Vest	8 years 9 months 18 days
Aggregate Intrinsic Value Outstanding	$ 5,538
Aggregate Intrinsic Value Options exercisable	4,213
Aggregate Instrinsic Value Options Expected to Vest	$ 1,267