Stock-Based Compensation - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended
	Mar. 03, 2014	Sep. 30, 2014	Sep. 30, 2013	Mar. 03, 2014 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2014 Restricted Stock [Member] Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted				99,289			28,761
Restricted stock granted, grant date fair value				$ 9.94			$ 9.57
Restricted stock awards, vesting period	2 years						1 year
Restricted stock awards, percentage vested on grant date	33.33%
Stock-based compensation expense		$ 720,000	$ 1,012,000		$ 300,000	$ 1,200,000
Nonvested restricted shares outstanding					143,585	143,585
Unrecognized compensation cost					$ 700,000	$ 700,000
Unrecognized compensation cost, recognition period						17 months