Stock-Based Compensation - Stock Option Activity Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Options (in shares)
Outstanding at beginning of year	1,688,500	1,914,000	1,902,000
Granted	94,500	80,000	70,000
Exercised	(60,000)	(195,000)	0
Expired or forfeited	(176,500)	(110,500)	(58,000)
Outstanding at end of year	1,546,500	1,688,500	1,914,000
Exercisable at end of year	1,546,500	1,678,500	1,833,500
Weighted- Average Exercise Price (in dollars per share)
Outstanding at beginning of year	$ 11.88	$ 11.38	$ 11.51
Granted	$ 5.22	$ 3.85	$ 3.55
Exercised	$ 4.96	$ 4.16	$ 0.00
Expired or forfeited	$ 13.01	$ 10.93	$ 6.33
Outstanding at end of year	$ 11.62	$ 11.88	$ 11.38
Exercisable at end of year	$ 11.62	$ 11.92	$ 11.48
Weighted- Average Remaining Contractual Term (in years)
Outstanding at end of year	3 years 6 months 0 days
Exercisable at end of year	3 years 6 months 0 days
Aggregate Intrinsic Value
Outstanding at end of year	$ 14
Exercisable at end of year	$ 14