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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Significant Accounting Policies (Details) (USD $)	3 Months Ended								12 Months Ended
Significant Accounting Policies (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Goodwill, Impairment Loss									$ 3,900,000us-gaap_GoodwillImpairmentLoss
Earnings Per Share, Diluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted
Marketable securities	22,264,000				22,220,000				22,264,000	22,220,000
Capitalized data and database costs carrying value	550,705,000				518,966,000				550,705,000	518,966,000
Subscription-based Revenues Contractual Term In Years									10 years
Employee Stock Purchase Plan Percent of Stock Price At Closing Date	85.00%								85.00%
Escrow Deposit	265,600,000us-gaap_EscrowDeposit				317,200,000us-gaap_EscrowDeposit				265,600,000us-gaap_EscrowDeposit	317,200,000us-gaap_EscrowDeposit
Reserves Incorrect Disposition Of Assets	20,200,000				21,400,000				20,200,000	21,400,000
Flood [Member]
Significant Accounting Policies [Line Items]
Capitalized data and database costs carrying value	55,416,000				55,416,000				55,416,000	55,416,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of other intangible assets, minimum (in years)									20 years
Escrow Deposits, Period Held									5 years
Maximum [Member] \| Buildings [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									40 years
Maximum [Member] \| Furniture and Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									10 years
Maximum [Member] \| Capitalized software [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									10 years
Maximum [Member] \| Database Development Costs [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									20 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of other intangible assets, minimum (in years)									2 years
Escrow Deposits, Period Held									2 years
Minimum [Member] \| Buildings [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									25 years
Minimum [Member] \| Furniture and Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									3 years
Minimum [Member] \| Capitalized software [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									3 years
Minimum [Member] \| Database Development Costs [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives, minimum (in years)									5 years
Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Earnings Per Share, Diluted	$ 0.04
Discontinued Operations [Member]
Significant Accounting Policies [Line Items]
Goodwill, Impairment Loss					9,600,000
Technology and Processing Solutions [Member]
Significant Accounting Policies [Line Items]
Goodwill, Impairment Loss									3,900,000	42,216,000
Goodwill, Impairment Loss, Net of Tax									$ 3,300,000