Summary Of Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Apr. 14, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Mar. 17, 2015 |
Jan. 05, 2015 |
Dec. 31, 2014 |
|
| Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Stock Issued During Period, Shares, Stock Splits | 1.00 | |||||||
| Allowance for doubtful accounts receivable | $ 5.1 | $ 3.3 | $ 5.1 | $ 3.3 | $ 3.7 | |||
| Shipping and handling costs | $ 12.8 | $ 11.7 | $ 25.8 | $ 23.0 | ||||
| Endomondo [Member] | ||||||||
| Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage | 100.00% | |||||||
| MyFitnessPal [Member] | ||||||||
| Summary Of Significant Accounting Policies [Line Items] | ||||||||
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage | 100.00% | |||||||