Stock Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
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 date. For independent directors, the vesting schedule is one-third of the granted options or restricted stock per year beginning one year after the grant date, with 100% vested on the third anniversary of the grant date.
Unrecognized compensation cost related to nonvested stock options granted	$ 0		$ 0
Stock options, granted	0	0	0	0
Compensation expense	$ 169,000	$ 118,000	$ 474,000	$ 445,000
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning period of Vesting of stock based award			1 year
Stock incentive plan, vesting per year			25.00%
Award vesting period			4 years
Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning period of Vesting of stock based award			1 year
Stock incentive plan, vesting per year			33.33%
Award vesting period			3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested restricted stock	$ 1,148,000		$ 1,148,000