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Revenue (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 496,408,000 | $ 506,871,000 | $ 503,732,000 | $ 501,810,000 | $ 499,410,000 | $ 491,355,000 | $ 470,876,000 | $ 404,490,000 | $ 2,008,821,000 | $ 1,866,131,000 | $ 1,562,662,000
Renewable service term period |  |  |  |  |  |  |  |  | 1 year |  |
Description of timing |  |  |  |  |  |  |  |  | The significant majority of the Company’s contracts with customers have an initial term of one year or less |  |
Renewal term |  |  |  |  |  |  |  |  | 1 year |  |
Minimum agreement period for account of unsatisfied performance obligations |  |  |  |  |  |  |  |  | 1 year |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cancellation notice period |  |  |  |  |  |  |  |  | 30 days |  |
Initial period preceding cancellation notice |  |  |  |  |  |  |  |  | 60 days |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cancellation notice period |  |  |  |  |  |  |  |  | 90 days |  |
Initial period preceding cancellation notice |  |  |  |  |  |  |  |  | 120 days |  |
Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract liabilities | 200,000 |  |  |  | 0 |  |  |  | $ 200,000 | 0 |
Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract liabilities | $ 4,600,000 |  |  |  | $ 0 |  |  |  | $ 4,600,000 | 0 |
Transferred over Time | Minimum |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service agreement period |  |  |  |  |  |  |  |  | 30 days |  |
Transferred over Time | Maximum |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service agreement period |  |  |  |  |  |  |  |  | 60 days |  |
Housekeeping |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 973,800,000 | 979,600,000 | 957,100,000
Dietary |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 1,035,000,000.0 | $ 886,500,000 | $ 605,500,000

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