Stock-Based Compensation - Equity-Classified Stock Compensation (Three Year Vest Restricted Shares) - Additional Information (Detail) - Three Year Vest Non-Vested Restricted Stock [Member] - USD ($) $ in Millions				9 Months Ended
	Feb. 09, 2015	Jan. 28, 2015	Jan. 22, 2014	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, Shares, Granted				19,700
Percent of restricted shares vested in each anniversaries, description				One-third of the restricted shares will vest on each of the first, second, and third anniversaries of the grant date, provided they are an employee of the Company on those dates.
Unrecognized compensation cost				$ 1.0
Weighted average period of compensation cost to be recognized				2 years 1 month 6 days
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, Shares, Granted		11,700	14,500
2010 Plan [Member] | Mr Albright [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, Shares, Granted	8,000