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Acquisition (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 27, 2011
Acquisition (Textual) |  |
Purchase price paid for acquisition of certain assets of the Jack Welch Management Institute |  | $ 7.0
Cash received form Mr. Welch representing his economic interest in JWMI |  | 2.8
Deferred payments to the sellers | 2.1 |
Value of acquired course content |  | 0.8
Estimated useful life of course content | 5 years |
Acquired indefinite-lived intangible assets | 1.6 |
Goodwill | $ 6.8 |

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