Net Income (Loss) Per Share - Reconciliation used in Computing Basic and Diluted Net Income (Loss) per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2009
Numerator:
Income (loss) from continuing operations	$ 37,403	$ (402)	$ 40,155	$ (7,350)	[1]	$ (3,491)	[1]
Gain from discontinued operations, net of tax	0	0	0	153	[1]	61	[1]	187
Net income (loss) used in computing basic and diluted net income (loss) per share	$ 37,403	$ (402)	$ 40,155	$ (7,197)	[1]	$ (3,430)	[1]
Denominator:
Shares used in computation of basic and diluted net income (loss) per share (weighted average common shares outstanding)	28,614	27,288	28,190	27,735	[1]	28,564	[1]
Dilutive potential common shares:
Shares used in computation of diluted net income (loss) per share	29,675	27,288	29,338	27,735	[1]	28,564	[1]
Basic net income (loss) per share from:
Continuing operations	$ 1.31	$ (0.01)	$ 1.42	$ (0.27)	[1]	$ (0.12)	[1]
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.01	[1]	$ 0.00	[1]
Total	$ 1.31	$ (0.01)	$ 1.42	$ (0.26)	[1]	$ (0.12)	[1]
Diluted net income (loss) per share from:
Continuing operations	$ 1.26	$ (0.01)	$ 1.37	$ (0.27)	[1]	$ (0.12)	[1]
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.01	[1]	$ 0.00	[1]
Total	$ 1.26	$ (0.01)	$ 1.37	$ (0.26)	[1]	$ (0.12)	[1]
Restricted Stock and RSUs [Member]
Dilutive potential common shares:
Dilutive potential common stocks			343	0		0
Stock Options [Member]
Dilutive potential common shares:
Dilutive potential common stocks			805	0		0

[1] See Note 1 "Significant Accounting Policies - Intangible Assets" of Notes to Consolidated Financial Statements.