Balance Sheet Detail (Details 5) (USD $)	3 Months Ended
	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of other assets
Long-term investments			$ 500,000
Long-term prepaid commissions		5,587,000	3,756,000
Deposits		2,697,000	2,889,000
Prepaid contract expense, long-term		7,643,000	4,914,000
Total other assets		15,927,000	12,059,000
Impairment loss on the investment	500,000
Restricted cash balance		1,400,000	1,400,000
Summary of accrued liabilities
Salaries and benefits payable		26,299,000	22,236,000
Accrued restructuring, current portion		1,050,000	809,000
Other		12,680,000	11,035,000
Total accrued liabilities		40,029,000	34,080,000
Summary of other long-term liabilities
Deferred rent		10,631,000	11,123,000
Accrued restructuring, long-term portion			531,000
Long-term deferred tax liability		2,930,000	534,000
Other		3,383,000	2,656,000
Total other long-term liabilities		16,944,000	14,844,000
Components of accumulated other comprehensive income
Accumulated net unrealized gain (loss) on marketable securities		(13,000)	7,000
Accumulated foreign currency translation adjustments		6,883,000	8,608,000
Accumulated other comprehensive income, net of taxes		$ 6,870,000	$ 8,615,000	$ 10,736,000