Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Weighted average shares outstanding:
Weighted average number of shares outstanding for basic per share calculation	17,588,163	17,436,731	17,546,773	17,389,934
Effect of dilutive potential shares:
Options	0	2,227	1,146	4,070
Nonvested stock	131,310	171,995	116,365	132,683
Adjusted weighted average shares for diluted per share calculation	17,719,473	17,610,953	17,664,284	17,526,687
Anti-dilutive shares	20,001	8,000	214,856	182,185