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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating activities    
Net income $ 324,140 $ 247,816
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 80,724 71,151
Deferred income tax (benefit) provision (19,045) 6,585
Loss on disposal of assets 4,767 5,144
Bad debt allowance (10) 24
Stock-based compensation expense 82,156 50,622
Excess tax benefit on stock-based compensation (12,971) (17,694)
Other 9 403
Changes in operating assets and liabilities:    
Accounts receivable 5,250 2,200
Inventory (2,851) (1,415)
Prepaid expenses and other current assets 547 (7,304)
Other assets (3,723) (3,428)
Accounts payable 14,706 3,389
Accrued liabilities 11,462 (19,966)
Income tax payable/receivable 41,274 28,531
Deferred rent 19,380 18,939
Other long-term liabilities 3,941 3,718
Net cash provided by operating activities 549,756 388,715
Investing activities    
Purchases of leasehold improvements, property and equipment (160,400) (136,665)
Purchases of investments (390,632) (293,929)
Maturities of investments 171,250 106,750
Net cash used in investing activities (379,782) (323,844)
Financing activities    
Acquisition of treasury stock (63,405) (97,655)
Excess tax benefit on stock-based compensation 12,971 17,694
Other financing proceeds (payments) (69) 185
Net cash used in financing activities (50,503) (79,776)
Effect of exchange rate changes on cash and cash equivalents (56) 428
Net change in cash and cash equivalents 119,415 (14,477)
Cash and cash equivalents at beginning of period 323,203 322,553
Cash and cash equivalents at end of period 442,618 308,076
Supplemental disclosures of cash flow information    
Increase in purchases of leasehold improvements, property and equipment accrued in accounts payable $ 13,804 $ 8,181