Property and Equipment - Additional Disclosures (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Property, Plant and Equipment [Abstract] | ||||
| Depreciation expense, inclusive of expense captured in cost of revenue | $ 3.2 | $ 3.3 | $ 10.0 | $ 9.7 |