Income Taxes - Schedule of Deferred Tax and Related Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Accrued bonus	$ 13,161	$ 19,572
Deferred revenue	11,334	9,536
Deferred rent	13,224	10,518
Stock-based compensation	31,705	27,538
Net operating losses	8,855	11,466
Unrealized losses	1,421	748
Tax credit carryforwards	22,918	18,066
Other	5,989	6,528
Deferred tax assets	108,607	103,972
Depreciation and amortization	(10,848)	(14,868)
Acquired intangible assets	(37,923)	(40,126)
Internal-use software development costs capitalized	(66,807)	(39,396)
Deferred tax liabilities	(115,578)	(94,390)
Valuation allowance	(1,217)	(1,222)
Net deferred tax (liabilities) assets	$ 8,188
Net deferred tax (liabilities) assets		$ 8,360