Stock Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended				9 Months Ended		1 Months Ended		1 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Restricted Stock	Dec. 31, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock Service Based Options	Sep. 30, 2014 Restricted Stock Performance Contingent Restricted Shares	Sep. 30, 2014 Restricted Stock Minimum Service Based Options	Sep. 30, 2014 Restricted Stock Maximum Service Based Options	Aug. 31, 2012 2012 Equity Incentive Plan	Sep. 30, 2014 2012 Equity Incentive Plan	Aug. 31, 2012 Previously Approved Plans	Sep. 30, 2014 2012 Plan and Previously Approved Plans	Sep. 30, 2014 2012 Plan and Previously Approved Plans Restricted Stock	Sep. 30, 2014 2012 Plan and Previously Approved Plans Non Vested Stock Options	Sep. 30, 2013 2012 Plan and Previously Approved Plans Non Vested Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares initially authorized for issuance under equity incentive plan												300,000
Additional shares authorized for issuance under equity incentive plan												17,666
Shares ceased to be issuable														17,666
Outstanding options to purchase shares of common stock	119,000		119,000		279,000										119,000
Unvested restricted shares outstanding						379,657	318,600	103,494	276,163							379,657
Outstanding shares remained available for future grants													245,660
Stock-based compensation expense	$ 71,000	$ 63,000	$ 195,000	$ 228,000
Weighted average fair value of options granted			$ 3.23	$ 2.82
Aggregate pre-tax intrinsic value			347,000
Unrecognized stock-based compensation expense related to the nonvested shares						679,000											13,000	18,000
Unrecognized stock-based compensation expense are expected to be recognized over a weighted average periods (years)						2 years 2 months 12 days											6 months	6 months
Vesting period										3 years	4 years
Vested						103,503
Intrinsic value of shares vested						384,500
Cancelled						34,793
Payment for withholding tax for cancellation of restricted shares			129,000	49,000		129,000
Restricted shares outstanding expected to vest						268,985
Aggregate intrinsic value						$ 887,650