Stock-Based Compensation (Detail) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Number of Options (in shares):
Beginning balance	1,688,500
Granted	0
Exercised	(30,000)
Expired or forfeited	0
Ending balance	1,658,500
Exercisable (in shares)	1,648,500
Weighted-Average Exercise Price (in dollars per share):
Beginning balance	$ 11.88
Granted	$ 0.00
Exercised	$ 5.35
Expired or forfeited	$ 0.00
Ending balance	$ 12.00
Exercisable (in Dollars per share)	$ 12.04
Outstanding, Weighted Average Remaining Contractual Term	3 years 6 months 11 days
Exercisable, Weighted Average Remaining Contractual Term	3 years 6 months 4 days
Outstanding, Aggregate Intrinsic Value	$ 226
Exercisable, Aggregate Intrinsic Value	$ 226