Stock-Based Compensation (Detail) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Number of Options (in shares):
Beginning balance	1,688,500
Granted	94,500
Exercised	(60,000)
Expired or forfeited	(5,000)
Ending balance	1,718,000
Exercisable (in shares)	1,708,000
Weighted-Average Exercise Price (in dollars per share):
Beginning balance	$ 11.88
Granted	$ 5.22
Exercised	$ 4.96
Expired or forfeited	$ 22.63
Ending balance	$ 11.73
Exercisable (in Dollars per share)	$ 11.76
Outstanding, Weighted Average Remaining Contractual Term	3 years 8 months 15 days
Exercisable, Weighted Average Remaining Contractual Term	3 years 8 months 9 days
Outstanding, Aggregate Intrinsic Value	$ 417
Exercisable, Aggregate Intrinsic Value	$ 417