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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator for basic and diluted earnings per share:
Net income	$ 7,558	$ 5,114	$ 14,832	$ 12,869
Denominator:
Weighted average shares outstanding-basic	52,475	51,342	53,013	51,727
Dilutive effect of stock-based awards	1,346	1,979	1,537	1,917
Diluted weighted average shares outstanding	53,821	53,321	54,550	53,644
Anti-dilutive stock-based awards excluded	336	565	328	898
Net income per common share:
Basic	$ 0.14	$ 0.10	$ 0.28	$ 0.25
Diluted	$ 0.14	$ 0.10	$ 0.27	$ 0.24