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Subsequent Events (Details) (USD $)
 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Nov. 08, 2012
Score
Oct. 23, 2012
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Oct. 31, 2012
Revolving credit facility [Member]
Nov. 08, 2012
Revolving credit facility [Member]
Apr. 04, 2011
Revolving credit facility [Member]
Jan. 03, 2011
Revolving credit facility [Member]
Sep. 30, 2012
Revolving credit facility [Member]
Minimum [Member]
Sep. 30, 2012
Revolving credit facility [Member]
Maximum [Member]
Nov. 08, 2012
Letter Of Credit [Member]
Nov. 08, 2012
Term Loan Facility [Member]
Apr. 04, 2011
Term Loan Facility [Member]
Debt Instrument [Line Items]                            
Maximum borrowing on credit facility             $ 100,000,000 $ 100,000,000 $ 100,000,000     $ 50,000,000 $ 125,000,000 $ 100,000,000
Additional borrowing under revolving credit facility           10,000,000                
Margin rate for interest if using base rate                   2.00% 2.50%      
Term loan facility, effective percentage   3.10%                        
Unused commitment fee       0.30% 0.40%         0.30% 0.40%      
Option to increase commitments under credit facility   50,000,000                        
Repayment of revolving credit facility     35,000,000                      
Term loan facility, amortization payments, during 2013   781,250                        
Term loan facility, amortization payments, during 2014   781,250                        
Term loan facility, amortization payments, during 2015   1,562,500                        
Term loan facility, amortization payments, during 2016   $ 1,562,500                        
Payment percentage of aggregate original principal amount of term loan facility in year one and two   0.625%                        
Payment percentage of aggregate original principal amount of term loan facility in year three and four   1.25%                        
Covenant terms required by credit facility 1) A total leverage ratio of not greater than 2.00:1.00; 2) A coverage ratio of not less than 1.75:1.00; 3) A Department of Education financial composite score of not less than 1.5.                          
Maximum total leverage ratio   2.00                        
Minimum coverage ratio   1.75                        
Minimum Department of Education Financial Composite Score   1.5