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Goodwill (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2017
Apr. 30, 2016
Dec. 31, 2015
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]            
Goodwill     $ 1,889,072      
Accumulated impairment losses     (7,525)      
Goodwill         $ 2,107,255 $ 1,881,547
Acquisitions         129,505 226,907
Translation adjustments         13,839 (1,199)
Goodwill     1,881,547   2,250,599 2,107,255
Rental Property Solutions [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         0  
Valuation Solutions Business [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         0  
PIRM Segment [Member]            
Goodwill [Line Items]            
Goodwill     963,680      
Accumulated impairment losses     (600)      
Goodwill         1,188,788 963,080
Acquisitions         127,805 226,907
Translation adjustments         13,839 (1,199)
Goodwill     963,080   1,028,623 1,188,788
PIRM Segment [Member] | Rental Property Solutions [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         5,521  
PIRM Segment [Member] | Valuation Solutions Business [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         (307,330)  
UWS Segment [Member]            
Goodwill [Line Items]            
Goodwill     925,392      
Accumulated impairment losses     (6,925)      
Goodwill         918,467 918,467
Acquisitions         1,700 0
Translation adjustments         0 0
Goodwill     $ 918,467   1,221,976 918,467
UWS Segment [Member] | Rental Property Solutions [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         (5,521)  
UWS Segment [Member] | Valuation Solutions Business [Member]            
Goodwill [Line Items]            
Reclassifications of solutions         307,330  
FNC, Inc. [Member]            
Goodwill [Line Items]            
Acquisitions   $ 220,300        
Adjustments recorded to goodwill         5,400  
FNC, Inc. [Member] | PIRM Segment [Member]            
Goodwill [Line Items]            
Acquisitions           225,700
Adjustments recorded to goodwill         5,400  
FNC, Inc. [Member] | UWS Segment [Member]            
Goodwill [Line Items]            
Acquisitions         1,700  
Mercury, Inc. [Member]            
Goodwill [Line Items]            
Acquisitions $ 105,300          
Adjustments recorded to goodwill       $ 5,800    
Mercury, Inc. [Member] | UWS Segment [Member]            
Goodwill [Line Items]            
Goodwill         105,300  
Myriad Development, Inc. and Clareity Ventures, Inc. [Member] | PIRM Segment [Member]            
Goodwill [Line Items]            
Goodwill         28,100  
Insignificant Acquisition [Member] | PIRM Segment [Member]            
Goodwill [Line Items]            
Acquisitions           $ 1,200
Adjustments recorded to goodwill         $ 200  
Minimum [Member]            
Goodwill [Line Items]            
Discount rate used in weighted average cost of capital calculation         8.50%  
Maximum [Member]            
Goodwill [Line Items]            
Discount rate used in weighted average cost of capital calculation         9.00%