Goodwill, Net (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill		$ 2,114,780
Accumulated impairment losses		(7,525)
Goodwill, net	$ 2,112,692	2,107,255
Translation adjustments	11,118
Goodwill, Purchase Accounting Adjustments	(5,681)
Property Intelligence [Member]
Goodwill [Roll Forward]
Goodwill		1,189,388
Accumulated impairment losses		(600)
Goodwill, net	1,194,225	1,188,788
Translation adjustments	11,118
Goodwill, Purchase Accounting Adjustments	(5,681)
Property Intelligence [Member] \| FNC, Inc. [Member]
Goodwill [Roll Forward]
Goodwill, Purchase Accounting Adjustments	5,400
Property Intelligence [Member] \| Insignificant Acquisition [Member]
Goodwill [Roll Forward]
Goodwill, Purchase Accounting Adjustments	200
Risk Management and Work Flow [Member]
Goodwill [Roll Forward]
Goodwill		925,392
Accumulated impairment losses		(6,925)
Goodwill, net	918,467	$ 918,467
Translation adjustments	0
Goodwill, Purchase Accounting Adjustments	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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