Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Weighted average shares outstanding:
Weighted average number of shares outstanding for basic per share calculation	17,260,078	17,083,201	17,213,648	17,035,541
Effect of dilutive potential shares:
Options	4,367	4,208	4,151	4,032
Nonvested stock	92,471	94,604	71,755	70,102
Adjusted weighted average shares for diluted per share calculation	17,356,916	17,182,013	17,289,554	17,109,675
Anti-dilutive shares	3,500	94,299	173,360	181,648