Stock Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonqualified options or restricted stock for key employees and independent director	500,000		500,000
Description of award terms			For key employees, the plan vesting is one-fourth of the granted options or restricted stock per year beginning one year after the grant date, with 100% vested on the fourth anniversary of the grant. For independent directors, the vesting schedule is one-third of the granted options per year beginning one year after the grant date, with 100% vested on the third anniversary of the grant.
Unrecognized compensation cost related to nonvested stock options granted under this plan	$ 0		$ 0
Stock options, granted	0	0	0	0
Stock options that were fully vested and exercisable	74,203		74,203		75,500
Compensation Expense	104	73	290	205
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Starting period of Vesting of stock based award			1 year
Stock incentive plan, vesting per year, portion			0.25
Aggregate percentage of stock based awards to be matured			100.00%
Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Starting period of Vesting of stock based award			1 year
Stock incentive plan, vesting per year, portion			0.33
Aggregate percentage of stock based awards to be matured			100.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested stock options granted	$ 784		$ 784