Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator for basic and diluted earnings per share:
Net income	$ 6,103	$ 3,884	$ 13,308	$ 7,275
Denominator:
Weighted average shares outstanding—basic	53,644	53,383	53,407	53,287
Dilutive effect of stock-based awards (in shares)	1,156	1,372	1,255	1,641
Diluted weighted average shares outstanding	54,800	54,755	54,662	54,928
Anti-dilutive stock-based awards excluded	153	361	173	309
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.11	$ 0.07	$ 0.25	$ 0.14
Diluted (in dollars per share)	$ 0.11	$ 0.07	$ 0.24	$ 0.13