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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) letter_of_credit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |
Rent expenses incurred | $ 20,000,000 | $ 18,000,000 | $ 17,000,000
Debt Instrument [Line Items] |  |  |
Number of letters of credit | letter_of_credit | 2 |  |
Standby Letters of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 18,000,000 |  |
First Lien Credit Facility [Member] | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity of credit facility | 250,000,000 |  |
Unused portion of credit facility | 234,000,000 |  |
First Lien Credit Facility [Member] | Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity of credit facility | 20,000,000 |  |
Workers' Compensation Obligation [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity of credit facility | 5,000,000 |  |
Unused portion of credit facility | $ 3,000,000 |  |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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