v3.2.0.727
Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 17, 2015
Jan. 05, 2015
Business Acquisition [Line Items]                
Goodwill $ 591,771   $ 123,256 $ 123,395 $ 591,771 $ 123,395    
Net revenues 783,577     613,249 1,592,213 1,258,593    
Proceeds from Lines of Credit         300,000 0    
Net Income $ 14,766     $ 14,502 $ 25,196 $ 21,337    
MyFitnessPal [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets             $ 16,190  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities             (3,291)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             61,199  
Goodwill             $ 402,728  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage             100.00%  
Transaction Value             $ 474,000  
Proceeds from Lines of Credit   $ 400,000            
Business Combination, Acquisition Related Costs   5,700            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net             463,927  
Endomondo [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets               $ 3,738
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities               (2,784)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               16,954
Goodwill               $ 70,290
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage               100.00%
Payments to Acquire Businesses               $ 85,000
Business Combination, Acquisition Related Costs   $ 600 $ 800          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net               87,244
Customer Lists [Member] | MyFitnessPal [Member]                
Business Acquisition [Line Items]                
User base             38,300  
Finite-Lived Intangible Asset, Useful Life         10 years      
Customer Lists [Member] | Endomondo [Member]                
Business Acquisition [Line Items]                
User base               10,600
Finite-Lived Intangible Asset, Useful Life         10 years      
Nutrition Database [Member] | MyFitnessPal [Member]                
Business Acquisition [Line Items]                
User base             4,500  
Finite-Lived Intangible Asset, Useful Life         10 years      
Nutrition Database [Member] | Endomondo [Member]                
Business Acquisition [Line Items]                
User base               0
Finite-Lived Intangible Asset, Useful Life                
Technology-Based Intangible Assets [Member] | MyFitnessPal [Member]                
Business Acquisition [Line Items]                
User base             3,200  
Finite-Lived Intangible Asset, Useful Life         5 years      
Technology-Based Intangible Assets [Member] | Endomondo [Member]                
Business Acquisition [Line Items]                
User base               5,000
Finite-Lived Intangible Asset, Useful Life         5 years      
Trade Names [Member] | MyFitnessPal [Member]                
Business Acquisition [Line Items]                
User base             $ 2,300  
Finite-Lived Intangible Asset, Useful Life         5 years      
Trade Names [Member] | Endomondo [Member]                
Business Acquisition [Line Items]                
User base               $ 400
Finite-Lived Intangible Asset, Useful Life         5 years