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Stock-based Compensation Plans and Awards (Details 2) (USD $)
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11 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Dec. 31, 2013
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Jan. 31, 2013
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Jan. 31, 2012
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| Stock-based compensation expenses: | |||
| Total stock-based compensation, recorded in costs and expenses | $ 40,041,000 | $ 25,500,000 | $ 9,187,000 |
| Capitalized cost related to internal use software and website development costs | 700,000 | ||
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Cost of revenue - Other
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| Stock-based compensation expenses: | |||
| Total stock-based compensation, recorded in costs and expenses | 1,946,000 | 1,214,000 | 582,000 |
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Product development
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| Stock-based compensation expenses: | |||
| Total stock-based compensation, recorded in costs and expenses | 8,802,000 | 4,530,000 | 1,638,000 |
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Sales and marketing
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| Stock-based compensation expenses: | |||
| Total stock-based compensation, recorded in costs and expenses | 20,222,000 | 12,294,000 | 4,866,000 |
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General and administrative
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| Stock-based compensation expenses: | |||
| Total stock-based compensation, recorded in costs and expenses | $ 9,071,000 | $ 7,462,000 | $ 2,101,000 |