Revenue Recognition - Remaining Performance Obligations, Expected Timing of Satisfaction (Details) |
3 Months Ended |
|---|---|
Mar. 31, 2018 | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | |
| Remaining Performance Obligations | |
| Percentage of remaining performance obligation expected to be recognized | 60.00% |
| Duration of expected recognition period for remaining performance obligation | 2 years |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | |
| Remaining Performance Obligations | |
| Percentage of remaining performance obligation expected to be recognized | 30.00% |
| Duration of expected recognition period for remaining performance obligation | 3 years |