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Significant Accounting and Reporting Policies (Details Textual)
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
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$ / shares
Jun. 30, 2016
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$ / shares
Mar. 31, 2016
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$ / shares
Dec. 31, 2015
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$ / shares
Sep. 30, 2015
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$ / shares
Jun. 30, 2015
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$ / shares
Mar. 31, 2015
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$ / shares
Dec. 31, 2016
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Segment
segment
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Dec. 31, 2015
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$ / shares
Dec. 31, 2014
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$ / shares
Significant Accounting Policies [Line Items]                      
Number of Operating Segments | segment                 4    
Depreciation and amortization                 $ 265,200,000 $ 278,400,000 $ 241,200,000
Net Income (Loss) Attributable to Parent $ (49,500,000) $ (41,200,000) $ (17,300,000) $ (12,600,000) $ (19,200,000) $ 4,000,000 $ 2,600,000 $ 6,600,000 $ (120,600,000) $ (5,900,000) $ 12,500,000
Earnings Per Share, Basic | $ / shares $ (0.27) $ (0.23) $ (0.09) $ (0.07) $ (0.11) $ 0.02 $ 0.02 $ 0.04 $ (0.66) $ (0.04) $ 0.09
Document Fiscal Year Focus                 2016    
Global Presence, Number of Countries 30               30    
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Number of reportable segments | Segment                 3    
Advertising costs                 $ 50,800,000 $ 43,100,000 $ 31,300,000
Exchange rate gains (losses)                 (300,000) 3,600,000 1,100,000
Impairment of intangible assets, finite-lived                 0 0 0
Expenses related to defined contribution profit sharing plan                 $ 19,100,000 17,000,000 14,100,000
Number of Data Sources                 90,000    
Building and Building Improvements [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life of the asset                 20 years    
Net Unrealized Gain/(Loss) On Available-for-sale Securities                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Other than Temporary Impairment Losses, Investments                 $ 0 0 0
Minimum [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life                 3 years    
Minimum [Member] | Internal Use Software [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life                 3 years    
Minimum [Member] | Computer Equipment and Purchased Software [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life of the asset                 3 years    
Minimum [Member] | Leasehold Improvements [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life of the asset                 5 years    
Maximum [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life                 40 years    
Maximum [Member] | Internal Use Software [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life                 7 years    
Maximum [Member] | Computer Equipment and Purchased Software [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life of the asset                 7 years    
Maximum [Member] | Leasehold Improvements [Member]                      
Summary of Significant Accounting Policies (Textual) [Abstract]                      
Estimated useful life of the asset                 7 years    
Service Life [Member]                      
Significant Accounting Policies [Line Items]                      
Depreciation and amortization                   28,800,000 17,500,000
Net Income (Loss) Attributable to Parent                   $ 18,400,000 $ 11,200,000
Earnings Per Share, Basic | $ / shares                   $ 0.11 $ 0.08