Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted average shares outstanding:
Basic	17,436,731	17,260,078	17,389,934	17,213,648
Effect of dilutive potential shares:
Options	2,227	4,367	4,070	4,151
Nonvested stock	171,995	92,471	132,683	71,755
Diluted	17,610,953	17,356,916	17,526,687	17,289,554
Anti-dilutive shares	8,000	3,500	182,185	173,360