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Acquisitions (Details)
$ in Thousands, NZD in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jan. 31, 2016
USD ($)
Jan. 31, 2016
NZD
Business Acquisition [Line Items]                  
Loss)/gain on Investments and other, net       $ (3,095) $ (20,056) $ (6,513) $ (17,873)    
Goodwill, Acquired During Period           127,900      
Goodwill, Purchase Accounting Adjustments           122,178      
Acquisition-related costs       900 $ 1,400 1,800 $ 7,500    
Property Intelligence [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Purchase Accounting Adjustments           122,178      
Maximum [Member]                  
Business Acquisition [Line Items]                  
Contingent consideration       $ 3,000   3,000      
Mercury, Inc. [Member]                  
Business Acquisition [Line Items]                  
Deferred tax liability acquired $ 14,400                
Mercury, Inc. [Member] | Property Intelligence [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period 99,500                
Mercury, Inc. [Member] | Client lists [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 41,300                
Estimated average life in years 10 years                
Mercury, Inc. [Member] | Technology-Based Intangible Assets [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 20,100                
Estimated average life in years 9 years                
Mercury, Inc. [Member] | Trade names [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 3,600                
Estimated average life in years     8 years            
Myriad Development, Inc. [Member]                  
Business Acquisition [Line Items]                  
Consideration transferred 22,000                
Deferred tax liability acquired 3,100                
Myriad Development, Inc. [Member] | Property Intelligence [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period 17,300                
Myriad Development, Inc. [Member] | Client lists [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 1,700                
Estimated average life in years 12 years                
Myriad Development, Inc. [Member] | Technology-Based Intangible Assets [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 5,800                
Estimated average life in years 8 years                
Myriad Development, Inc. [Member] | Trade names [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 1,600                
Estimated average life in years 7 years                
Clareity Ventures, Inc. [Member]                  
Business Acquisition [Line Items]                  
Consideration transferred $ 15,000                
Deferred tax liability acquired 2,800                
Clareity Ventures, Inc. [Member] | Property Intelligence [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period 11,100                
Clareity Ventures, Inc. [Member] | Client lists [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 3,400                
Estimated average life in years 10 years                
Clareity Ventures, Inc. [Member] | Technology-Based Intangible Assets [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 2,000                
Estimated average life in years 5 years                
Clareity Ventures, Inc. [Member] | Trade names [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 900                
Estimated average life in years 7 years                
FNC, Inc. [Member]                  
Business Acquisition [Line Items]                  
Contingent consideration     $ 8,000            
Cash paid at closing in acquisition     400,000            
Deferred tax liability acquired     85,400            
FNC, Inc. [Member] | Property Intelligence [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Acquired During Period     220,200            
Goodwill, Purchase Accounting Adjustments           $ 5,400      
FNC, Inc. [Member] | Client lists [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired     $ 145,300            
Estimated average life in years     16 years            
FNC, Inc. [Member] | Trade names [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired     $ 15,900            
Estimated average life in years     19 years            
FNC, Inc. [Member] | Property and equipment [Member]                  
Business Acquisition [Line Items]                  
Estimated average life in years     12 years            
Property and equipment acquired     $ 79,800            
FNC, Inc. [Member] | Non-compete agreements [Member]                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired     $ 18,800            
Estimated average life in years     5 years            
FNC, Inc. [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Consideration transferred     $ 475,000            
Certain closing adjustments to be paid     $ 75,000            
PIQ Acquisition [Member]                  
Business Acquisition [Line Items]                  
Remaining equity interest acquired               40.00% 40.00%
Mandatorily redeemable noncontrolling interests               $ 19,000 NZD 27.8
Mercury, Inc. [Member]                  
Business Acquisition [Line Items]                  
Remaining equity interest acquired   45.00%              
Payments to Acquire Equity Method Investments   $ 70,000              
Business Acquisition, Percentage of Voting Interests Acquired 55.00%                
Call Option Fair Value   $ 4,600              
Consideration transferred $ 83,000                
Loss)/gain on Investments and other, net $ 1,900