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Computation of Earnings Per Share - Summary of Calculation of Basic Earning Per Common Share and Diluted Earning Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income	$ 8,576	$ 9,155
Denominator:
Denominator for basic earnings per share- weighted average common shares	24,382	23,985
Effect of dilutive stock options	244	303
Effect of other common stock equivalents	735	660
Denominator for diluted earnings per share- adjusted weighted average common shares	25,361	24,948
Basic Earnings Per Share	$ 0.35	$ 0.38
Diluted Earnings Per Share	$ 0.34	$ 0.37

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