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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows provided by operating activities:    
Net income $ 62,554 $ 48,538
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 7,668 5,748
Excess tax benefits from share-based compensation (3,678) (336)
Amortization of debt issuance costs   48
Provision for bad debts 14,881 13,492
Depreciation and amortization 18,602 15,784
Loss on asset disposal   202
Gain on proceeds received from note receivable (3,646)  
Deferred income taxes 2,404 (2,152)
Changes in assets and liabilities:    
Restricted cash and cash equivalents 6,249 (912)
Accounts receivable (14,916) (10,552)
Prepaid expenses and other (5,854) (2,671)
Due to/from related parties (29) 101
Accounts payable 1,859 (962)
Accrued liabilities and employee related liabilities (3,753) 9,046
Income taxes receivable/payable (4,055) 22,464
Deferred rent (721) 612
Deferred revenue 29,889 24,956
Student deposits (5,668) 1,328
Net cash provided by operating activities 101,786 124,734
Cash flows used in investing activities:    
Capital expenditures (59,168) (73,619)
Purchase of land and building related to offsite development (11,209) (818)
Purchases of investments (101,040)  
Proceeds from sale or maturity of investments 37,548  
Restricted funds held for derivative collateral 140 180
Proceeds received from note receivable 29,187  
Net cash used in investing activities (104,542) (74,257)
Cash flows provided by (used in) financing activities:    
Principal payments on notes payable and capital lease obligations (5,024) (1,772)
Repurchase of common shares including shares withheld in lieu of income taxes (9,009) (4,925)
Excess tax benefits from share-based compensation 3,678 336
Net proceeds from exercise of stock options 14,816 4,339
Net cash provided by (used in) financing activities 4,461 (2,022)
Net increase in cash and cash equivalents 1,705 48,455
Cash and cash equivalents, beginning of period 105,111 21,189
Cash and cash equivalents, end of period 106,816 69,644
Supplemental disclosure of cash flow information    
Cash paid for interest 1,592 446
Cash paid for income taxes 44,108 19,615
Cash received for income tax refunds 715 7,654
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 6,901 7,636
Tax benefit of Spirit warrant intangible 201 199
Shortfall tax expense from share-based compensation $ 206 $ 200