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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents | 60 to 90 days |  |
Reduced pledge collateral | $ 85 |  | $ 225
Note receivable from a financial institution at fair market value |  |  | 27,000
Interest rate on notes | 11.00% |  |
Interest rate on loan | 6.00% |  |
Default rate | 5.00% |  |
Interest income and other income on the loan | 2,187 |  |
Default interest held under escrow | 2,068 |  |
Reduction in revenue due to scholarships offered to students | 49,559 | 44,099 |
Percent of financial aid earn by student | 100.00% |  |
Period for write off of inactive student accounts | 150 days |  |
Interest Rate Corridor [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Interest rate receivable on interest rate swap amortizing notional amount | 30 Day LIBOR |  |
Fair value of interest rate corridor instruments | 2,005 |  |
Inception date of derivative agreements | Mar. 01, 2013 |  |
Maturity date of derivative agreements | Dec. 20, 2019 |  |
Notional amount of interest rate swap | 87,324 |  |
Interest rate payable on interest rate corridor if 30 day LIBOR is less than 1.5% | 30 Day LIBOR |  |
Interest rate payable on interest rate corridor 30 day LIBOR equal to 1.5% through 3% | 1.50% |  |
Interest rate payable on interest rate corridor 30 day LIBOR exceeds 3.0% | 30 Day LIBOR less 1.5% |  |
Interest expense on derivatives related to credit risk | 10 |  |
Interest Rate Swap [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Interest rate receivable on interest rate swap amortizing notional amount | 30 Day LIBOR |  |
Inception date of derivative agreements | May 01, 2010 |  |
Maturity date of derivative agreements | Apr. 30, 2014 |  |
Notional amount of interest rate swap | 9,343 |  |
Fixed interest rate payable on the amortizing notional amount | 3.245% |  |
Pledged collateral as restricted cash | 85 |  | 225
Interest expense on derivatives related to credit risk | 10 |  |
Interest Rate Swap [Member] | Accrued Liabilities [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value of interest rate swap liability | 247 |  |
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value of interest rate swap liability |  |  | $ 390

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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