Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator for basic and diluted earnings per share:
Net income	$ 3,391	$ 3,298
Denominator:
Weighted average shares outstanding-basic	53,190	52,746
Dilutive effect of stock-based awards	1,934	1,854
Diluted weighted average shares outstanding	55,124	54,600
Anti-dilutive stock-based awards excluded	315	1,232
Net income per common share:
Basic	$ 0.06	$ 0.06
Diluted	$ 0.06	$ 0.06