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Summary of Significant Accounting Policies (Details 3) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
|
Dec. 31, 2012
|
Dec. 31, 2011
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Jun. 30, 2011
Series A Common Stock
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Dec. 31, 2012
Student computers
|
Dec. 31, 2012
Computer hardware
|
Dec. 31, 2012
Computer software
Minimum
|
Dec. 31, 2012
Computer software
Maximum
|
Dec. 31, 2012
Web site development costs
|
Dec. 31, 2012
Office equipment
|
Dec. 31, 2012
Furniture and fixtures
|
Dec. 31, 2012
Leasehold improvements
Minimum
|
Dec. 31, 2012
Leasehold improvements
Maximum
|
Dec. 31, 2012
Capitalized software
|
Dec. 31, 2011
Capitalized software
|
Dec. 31, 2012
Capitalized software
|
Dec. 31, 2011
Capitalized software
|
|
| Property, equipment and capitalized software development costs | ||||||||||||||||||
| Useful Life | 3 years | 3 years | 3 years | 5 years | 3 years | 5 years | 7 years | 3 years | 12 years | 3 years | ||||||||
| Capitalized software development additions | $ 11,600,000 | $ 8,600,000 | ||||||||||||||||
| Amortization expense | 3,400,000 | 3,100,000 | 6,700,000 | 5,800,000 | ||||||||||||||
| Series A Special Stock | ||||||||||||||||||
| Issuance of Special A Stock in connection with acquisition (in shares) | 2,750,000 | |||||||||||||||||
| Conversion into common stock ratio | 1 | |||||||||||||||||
| Capitalized Curriculum Development Costs | ||||||||||||||||||
| Estimated useful life of the software | 5 years | |||||||||||||||||
| Capitalized curriculum development costs | 9,628,000 | 6,469,000 | ||||||||||||||||
| Amortization expense | $ 3,600,000 | $ 3,100,000 | $ 7,100,000 | $ 6,000,000 | ||||||||||||||