Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted average shares outstanding:
Weighted average number of shares outstanding for basic per share calculation	17,566,097	17,410,971	17,525,937	17,366,141
Effect of dilutive potential shares:
Options	1,379	3,717	1,715	2,741
Nonvested stock	117,671	114,412	121,968	159,219
Adjusted weighted average shares for diluted per share calculation	17,685,147	17,529,100	17,649,620	17,528,101
Anti-dilutive shares	30,001	0	211,101	190,385