Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES:
Net income	$ 26,350	$ 7,800
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,999	32,430
Provision (benefit) for doubtful accounts and sales returns	2,953	(290)
Stock-based compensation	82,293	31,949
Excess income tax benefit from stock-based compensation	(17,559)	(10,367)
Changes in operating assets and liabilities:
Accounts receivable	(272)	(22,457)
Deferred commissions	543	(2,073)
Prepaid expenses and other assets	(17,846)	(20,274)
Accounts payable and other liabilities	20,815	26,816
Income taxes, net	(726)	14,484
Deferred revenue	73,444	52,195
Net cash provided by operating activities	227,994	110,213
INVESTING ACTIVITIES:
Purchases of property and equipment	(137,467)	(59,691)
Purchases of investments	(256,925)	(179,377)
Sales of investments	76,420	24,304
Maturities of investments	45,127	60,726
Payments for intangible assets and acquisitions, net of cash acquired	(6,547)	(47,900)
Changes in deposits and restricted cash	(3,543)	(2,702)
Net cash used in investing activities	(282,935)	(204,640)
FINANCING ACTIVITIES:
Proceeds from issuance of common stock from employee stock options	19,738	23,891
Proceeds from issuance of common stock from employee stock purchase plan	11,500	7,718
Excess income tax benefit from stock-based compensation	17,559	10,367
Other financing activities	813	(140)
Net cash provided by financing activities	49,610	41,836
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(2,407)	(81)
CHANGE IN CASH AND CASH EQUIVALENTS	(7,738)	(52,672)
CASH AND CASH EQUIVALENTS—Beginning of period	270,408	339,048
CASH AND CASH EQUIVALENTS—End of period	262,670	286,376
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchases of property and equipment recorded in accounts payable and accrued liabilities	36,103	17,402
Vesting of early exercised stock options	547	2,630
Issuance of Class A common stock and stock options for business combinations	$ 40,927	$ 72,461