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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 22,611 $ 21,376
Property and equipment, accumulated depreciation 346,718 381,415
Intangible assets, amortization 1,400 800
Student receivables, allowance for doubtful accounts, non-current $ 2,051 $ 1,766
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 84,254,021 83,538,033
Common stock, shares outstanding 69,093,603 68,519,005
Treasury, Shares in treasury 15,160,418 15,019,028