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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2016
Significant Accounting Policies [Abstract]  
Schedule of graduation fund liability
  March 31, 2015  March 31, 2016 
Balance at beginning of period $9,706  $20,937 
Revenue deferred  3,603   5,564 
Benefit redeemed  (634)  (3,236)
Balance at end of period $12,675  $23,265 
Schedule of tuition receivable and allowance for doubtful accounts
  December 31, 2015  March 31, 2016 
Tuition receivable $28,543  $28,839 
Allowance for doubtful accounts  (10,024)  (10,226)
Tuition receivable, net $18,519  $18,613 
Schedule of allowance for doubtful accounts
  For the three months ended 
  March 31, 
  2015  2016 
Allowance for doubtful accounts, beginning of period $8,835  $10,024 
Additions charged to expense  3,470   3,068 
Write-offs, net of recoveries  (3,617)  (2,866)
    Allowance for doubtful accounts, end of period $8,688  $10,226 
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share
  For the three months ended 
  March 31, 
  2015  2016 
Weighted average shares outstanding used to compute basic earnings per share  10,579   10,596 
Incremental shares issuable upon the assumed exercise of stock options  19   — 
Unvested restricted stock  140   186 
Shares used to compute diluted earnings per share  10,738   10,782