Accrued Expenses and Other Current Liabilities - (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Bonuses and commissions	$ 10,245	$ 10,999
Accrued compensation	10,047	18,392
Other employee expenses	5,491	7,796
Current portion of facility exit obligation	1,443	1,515
Other	13,206	9,357
Total accrued expenses and other current liabilities	$ 40,432	$ 48,059