Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Weighted average shares outstanding:
Weighted average number of shares outstanding for basic per share calculation	17,410,971	17,233,264	17,366,141	17,190,070
Effect of dilutive potential shares:
Options	3,717	3,750	2,741	4,031
Nonvested stock	114,412	40,210	159,219	74,455
Adjusted weighted average shares for diluted per share calculation	17,529,100	17,277,224	17,528,101	17,268,556
Anti-dilutive shares	0	187,179	190,385	210,570