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Commitments and Contingencies - Narrative (Details)	12 Months Ended
	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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Number of Letters of Credit

+ References

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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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-SubTopic 10
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