Commitments and Contingencies (Details) (USD $)	12 Months Ended						1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Westlake Building Operating Lease [Member] Office_Buildings	Dec. 31, 2012 CoreLogic India [Member] Extensions	Jul. 26, 2011 CoreLogic India [Member]	Jul. 26, 2011 CoreLogic India [Member] Business Process and Information Technology Services [Member]
Long-term Purchase Commitment [Line Items]
Number of buildings exited and ceased use				2
Operating leases pre-tax charge for vacated premises				$ 14,200,000
Operating leases, rent expense	52,300,000	63,200,000	57,000,000
Disposal group, sales price						50,000,000
Initial Term of Master Professional Services Agreement					7 years
Number of Extensions Allowed Under Master Professional Servicces Agreement					3
Master Professional Servicces Agreement, Extension Period					1 year
Period Subject to Minimum Commitment Under Master Professional Servicces Agreement					5 years
Long-term purchase commitment, amount							303,500,000
Disposal group, deferred gain on disposal						27,100,000
Remaining minimum commitment					$ 277,600,000