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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities    
Net income $ 83,069 $ 76,584
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,754 22,936
Deferred income tax provision (benefit) 1,551 (1,923)
Loss on disposal of assets 1,559 1,340
Bad debt allowance (20) 9
Stock-based compensation expense 27,359 15,387
Excess tax benefit on stock-based compensation (8,955) (1,869)
Other 64 177
Changes in operating assets and liabilities:    
Accounts receivable 7,439 1,309
Inventory (2,160) (340)
Prepaid expenses and other current assets (4,014) (4,376)
Other assets (2,365) (1,588)
Accounts payable 8,006 773
Accrued liabilities (15,159) (33,893)
Income tax payable/receivable 48,088 42,721
Deferred rent 6,764 5,880
Other long-term liabilities 2,798 2,123
Net cash provided by operating activities 179,778 125,250
Investing activities    
Purchases of leasehold improvements, property and equipment (47,230) (36,495)
Purchases of investments (89,782) (54,598)
Maturities of investments 49,500 39,500
Net cash used in investing activities (87,512) (51,593)
Financing activities    
Acquisition of treasury stock (12,736) (50,965)
Excess tax benefit on stock-based compensation 8,955 1,869
Other financing proceeds (payments) (56) 120
Net cash used in financing activities (3,837) (48,976)
Effect of exchange rate changes on cash and cash equivalents (40) (304)
Net change in cash and cash equivalents 88,389 24,377
Cash and cash equivalents at beginning of period 323,203 322,553
Cash and cash equivalents at end of period 411,592 346,930
Supplemental disclosures of cash flow information    
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable $ (290) $ 2,813