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Revenue (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue | $ 506,871,000 | $ 491,355,000 | $ 1,512,413,000 | $ 1,366,721,000 |
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 |  |
Housekeeping |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  |  | 48.50% | 53.70% |
Revenue | 242,208,000 | 247,395,000 | $ 734,164,000 | $ 733,737,000 |
Dietary |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of revenue |  |  | 51.50% | 46.30% |
Revenue | 264,663,000 | $ 243,960,000 | $ 778,249,000 | $ 632,984,000 |
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 | 0 |  | $ 0 |  | $ 0
Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities | $ 0 |  | $ 0 |  | $ 0

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