Certain Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Certain Balance Sheet Accounts [Abstract]

Summary of Property and Equipment

	2012		2011
Computers and equipment	$	17,614	$	19,965
Computer software		22,242		19,685
Furniture and fixtures		8,561		8,566
Leasehold improvements		25,640		26,279
Total property and equipment		74,057		74,495
Less accumulated depreciation and amortization		27,757		24,047
	$	46,300	$	50,448

Summary of Accrued Expenses and Other Current Liabilities

	2012		2011
Payroll and related benefits	$	16,293	$	16,166
Taxes		3,714		4,742
Other		10,071		9,245
	$	30,078	$	30,153

Summary of Non-current Liabilities

	2012		2011
Deferred tax liability	$	361	$	8,646
Deferred rent		6,936		6,671
Other		2,136		2,263
	$	9,433	$	17,580

Summary of Allowance for Doubtful Accounts

	2012			2011			2010
Balance, beginning of year	$	326		$	407		$	406
Provision for doubtful accounts		708			233			212
Write-offs		(630	)		(314	)		(211	)
Balance, end of year	$	404		$	326		$	407