Significant Accounting Policies - Shares Used in Computation of Basic and Diluted Per Share Information (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Weighted average shares outstanding:
Weighted average number of shares outstanding for basic per share calculation	17,148,043	16,966,525
Effect of dilutive potential shares:
Options	4,290	3,830
Nonvested stock	116,383	103,188
Adjusted weighted average shares for diluted per share calculation	17,268,716	17,073,543
Anti-dilutive shares	195,945	187,344