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ACQUISITION (Details) (USD $)
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0 Months Ended |
3 Months Ended |
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Apr. 03, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Apr. 01, 2014
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| Business Acquisition [Line Items] |
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| Payments to acquire businesses |
$ 587,104,000 |
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| Closing purchase price adjustments |
2,104,000 |
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| Post closing purchase price adjustments |
2,886,000 |
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| Goodwill |
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1,137,707,000 |
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1,138,805,000 |
718,587,000 |
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| Apartments.com [Member] |
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| Business Acquisition [Line Items] |
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| Goodwill |
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421,724,000 |
| Goodwill tax deductible amount |
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421,724,000 |
| Business combination, acquisition related costs |
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$ 0 |
$ 1,100,000 |
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| Customer Contracts [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
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10 years |
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| Customer Contracts [Member] | Apartments.com [Member] |
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| Business Acquisition [Line Items] |
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| Number of distinct intangible assets |
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1 |
| Estimated useful life of acquired assets |
10 years |
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| Developed Technology Rights [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
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5 years |
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| Developed Technology Rights [Member] | Apartments.com [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
1 year |
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| Trade Names and Other Intangible Assets [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
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13 years |
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| Trade Names and Other Intangible Assets [Member] | Apartments.com [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
13 years |
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| Building Photography [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
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5 years |
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| Building Photography [Member] | Apartments.com [Member] |
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| Business Acquisition [Line Items] |
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| Estimated useful life of acquired assets |
3 years |
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