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
	Mar. 31, 2016	Mar. 31, 2015
Numerator for basic and diluted earnings per share:
Net income	$ 3,463	$ 7,205
Denominator:
Weighted average shares outstanding—basic	53,693	53,167
Dilutive effect of stock-based awards (in shares)	805	1,346
Diluted weighted average shares outstanding	54,498	54,513
Anti-dilutive stock-based awards excluded	525	362
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.06	$ 0.14
Diluted (in dollars per share)	$ 0.06	$ 0.13