Accrued Expenses and Other Current Liabilities - (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities, Current [Abstract]
Taxes payable	$ 4,187	$ 1,941
Bonuses and commissions	22,322	10,999
Accrued compensation	16,610	18,392
Other employee expenses	11,926	7,796
Current portion of facility exit obligation	1,042	1,515
Other	12,043	7,416
Total accrued expenses and other current liabilities	$ 68,130	$ 48,059