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Term Loan and Revolving Credit Facility (Details Textual)		1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 09, 2012 USD ($)	Nov. 30, 2012	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Term Loan and Revolving Credit Facility (Textual)
Maturity date		Dec. 31, 2016
Debt			$ 115,625,000		$ 115,625,000
Term loan facility, quarterly amortization payments, during 2013	$ 781,250
Term loan facility, quarterly amortization payments, during 2014	781,250
Term loan facility, quarterly amortization payments, during 2015	1,562,500
Term loan facility, quarterly amortization payments, during 2016	$ 1,562,500
Quarterly payment percentage of aggregate original principal amount of term loan facility in year one and two	0.625%
Quarterly payment percentage of aggregate original principal amount of term loan facility in year three and four	1.25%
Cash interest paid			$ 1,100,000	$ 1,100,000	$ 2,200,000	$ 2,200,000
Covenant terms required by credit facility					a leverage ratio of not greater than 2 to 1. Leverage ratio is defined as the ratio of total debt to trailing four-quarter EBITDA (earnings before interest, taxes, depreciation, amortization and non-cash charges such as stock-based compensation). a coverage ratio of not less than 1.75 to 1. Coverage ratio is defined as the ratio of trailing four-quarter EBITDA and rent expense to trailing four-quarter interest and rent expense. a Department of Education Financial Responsibility Composite Score of not less than 1.5.
Maximum total leverage ratio			2		2
Minimum coverage ratio			1.75		1.75
Minimum department of education financial composite score			1.5		1.5
Minimum [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value	$ 100,000,000
Margin rate for interest if using base rate	2.00%
Unused commitment fee	0.30%
Maximum [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate	2.50%
Unused commitment fee	0.40%
Revolving Credit Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value	$ 100,000,000
Revolving credit facility, outstanding	0
Revolving Credit Facility [Member] | Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Debt instrument description of variable rate basis					Base rate
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Term Loan and Revolving Credit Facility (Textual)
Debt instrument description of variable rate basis					LIBOR
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate					2.00%
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
Term Loan and Revolving Credit Facility (Textual)
Margin rate for interest if using base rate					2.50%
Term Loan Facility [Member]
Term Loan and Revolving Credit Facility (Textual)
Revolving credit facility, value	$ 125,000,000
Term Loan Facility [Member] | Interest Rate Swap [Member]
Term Loan and Revolving Credit Facility (Textual)
Interest rate swap, fixed rate minimum					2.85%
Interest rate swap, fixed rate maximum					3.35%
Term Loan Facility [Member] | Minimum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee					0.30%
Term Loan Facility [Member] | Maximum [Member]
Term Loan and Revolving Credit Facility (Textual)
Unused commitment fee					0.40%

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- Definition

Maximum leverage ratio to be maintained under credit facility.

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Minimum coverage ratio to be maintained under credit facility.

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Minimum department of education financial composite score to be maintained under credit facility.

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The percentage of the aggregate original principal amount of the term loan facility that is paid quarterly in year one and two.

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The percentage of the aggregate original principal amount of the term loan facility that is paid quarterly in year three and four.

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Term Loan Facility, Quarterly Amortization Payments, year four.

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Term Loan Facility, Quarterly Amortization Payments, year one.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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The amount of cash paid for interest during the period.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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