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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 23,172 $ 28,172
Student receivables, allowance for doubtful accounts, non-current $ 8,071 $ 11,982
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 81,876,758 81,616,987
Common stock, shares outstanding 67,158,417 67,069,734
Treasury, Shares in treasury 14,718,341 14,547,253