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ACQUISITIONS (Schedule of Assets Acquired and Liabilities Assumed of Loopnet Acquisition) (Details) (LoopNet [Member], USD $) In Thousands, unless otherwise specified	Apr. 30, 2012
LoopNet [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 105,464
Accounts receivable	3,021
Goodwill	625,174
Acquired trade names and other	48,700
Acquired customer base	71,500
Acquired database technology	52,100
Deferred income taxes, net	(32,623)
Other assets and liabilities	10,112
Fair value of identifiable net assets acquired	$ 883,448

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Amount of current and non-current other assets and other liabilities, net acquired at the acquisition date.

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The amount of goodwill recognized as of the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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