SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]
Term of subscription-based license agreements (in years)	1 year
Material gains or losses from foreign currency exchange transactions	$ 0	$ 0	$ 0
Reclassifications out of accumulated other comprehensive loss	0	0	0
Advertising costs	5,700,000	4,400,000	2,500,000
Maximum original maturity of highly liquid investments to be considered cash equivalents (in months)	3 months
Cash held to support letters of credit for security deposits	105,000	0
Short-term investment maturities (in days)	90 days
Available for sale short term investment contractual maturities (in years)	1 year
Number of customers accouting for more than 5% of revenue (in customers)	0	0	0
Significant customer revenue threshold percent	5.00%	5.00%	5.00%
Amortization expense for capitalized product development costs	15,183,000	13,607,000	2,237,000
Capitalized product development costs, net	144,472,000	170,632,000
Capitalized debt issuance costs	6,542,000	9,556,000
Amortization of debt issuance costs	3,014,000	1,989,000	0
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Short-term investment maturities (in days)	90 days
Available for sale short term investment contractual maturities (in years)	1 year
Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	39 years
Furniture and Office Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	5 years
Furniture and Office Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	10 years
Vehicles [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	5 years
Computer Hardware and Software [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	2 years
Computer Hardware and Software [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life (in years)	5 years
Acquired Database Technology [Member]
Summary of Significant Accounting Policies [Line Items]
Capitalized product development costs, net	36,295,000	47,655,000
Acquired Database Technology [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	2 years
Acquired Database Technology [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	10 years
Acquired Trade Names and Other [Member]
Summary of Significant Accounting Policies [Line Items]
Capitalized product development costs, net	50,102,000	50,375,000
Acquired Trade Names and Other [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	2 years
Acquired Trade Names and Other [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	10 years
Acquired Customer Base [Member]
Summary of Significant Accounting Policies [Line Items]
Number of distinct intangible asset	1
Capitalized product development costs, net	56,226,000	71,465,000
Building Photography [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	5 years
Capitalized product development costs, net	1,738,000	835,000
Capitalized Product Development Costs [Member]
Summary of Significant Accounting Policies [Line Items]
Amortization expense for capitalized product development costs	191,000	191,000	80,000
Capitalized product development costs, net	$ 111,000	$ 302,000
Capitalized Product Development Costs [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	3 years
Capitalized Product Development Costs [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)	5 years