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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Adjusted EBITDA Threshold For Margin Step Down

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Cash, cash equivalents and managed accessibility.

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Contribution rate of subsidiaries to funds.

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Debt instrument annual amortization of amount outstanding percent.

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Debt instrument covenant compliance annual limit on capital expenditures.

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Debt Instrument, Covenant Compliance, Minimum Adjusted EBITDA

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Debt Instrument, Covenant Compliance, Percent Of Cash Proceeds From Disposition Of Assets To Be used To Repay Debt

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Debt Instrument, Covenant Compliance, Repayment Of Debt, Amount Of Property Sales To Be Used In Reinvestment

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Debt instrument, floor interest rate.

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Debt Instrument, Interest Rate, Stated Percentage, Margin Step Down If Certain EBITDA Is Achieved

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Debt instrument, number of credit facilities.

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Debt Instrument, Prepayment Premium, Percent

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Line of credit facility able to be drawn.

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Line of credit facility cash and availability.

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Line of credit facility, collateral line cap, percent.

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Line Of Credit Facility, Maximum Borrowing Capacity, Uncommitted Accordion

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Operating lease capital equivalent.

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Operating lease commitment.

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Operating lease term.

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Debt and Financing - Additional Information (Details)			12 Months Ended
Debt and Financing - Additional Information (Details)	Sep. 11, 2019 USD ($)	Jan. 31, 2018	Dec. 31, 2019 USD ($) Facility	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 13, 2014 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 11,200,000	$ 0	$ 0
Contribution rate of subsidiaries to funds			25.00%
Acquisition of property and equipment			$ 143,200,000	145,400,000	$ 103,300,000
Minimum annual rentals 2020				138,400,000
Future minimum payments due				429,200,000
Revenue Equipment
Debt Instrument [Line Items]
Operating lease commitment			$ 111,000,000
Operating lease term			4 years
Operating Lease Capital Equivalent			$ 131,800,000
Minimum annual rentals 2020			154,400,000
Future minimum payments due			$ 451,100,000
Minimum \| 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage			0.25%
Maximum \| 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage			0.375%
2014 Financing
Debt Instrument [Line Items]
Number of credit facilities \| Facility			2
2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, total cash and availability				39,200,000
Managed Accessibility			$ 200,000	1,200,000
Restricted cash			29,000,000	25,000,000
Cash, cash equivalents and managed accessibility			80,400,000	203,800,000
2014 ABL Facility Credit Agreement \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity, uncommitted accordion						$ 100,000,000
Letters of credit outstanding, amount			$ 337,800,000	$ 341,300,000
Collateral line cap, percent			10.00%
Restricted cash			$ 29,000,000
Amended Second A&R CDA
Debt Instrument [Line Items]
Annual amortization of amount outstanding, percent		2.00%
Debt instrument maturity date		Dec. 31, 2022
Term Loan \| 2014 Financing
Debt Instrument [Line Items]
Principal amount issued			$ 600,000,000
Term Loan \| New Term Loan Agreement
Debt Instrument [Line Items]
Principal amount issued	$ 600,000,000
Floor interest rate	1.00%
Basis spread on variable rate	7.50%
Margin step down if certain EBITDA is achieved	1.00%
Adjusted EBITDA threshold for margin step down	$ 400,000,000
Minimum adjusted EBITDA	$ 200,000,000
Percent of cash proceeds from disposition of assets to be used to repay debt	100.00%
Repayment of debt, amount of property sales to be used in reinvestment	$ 40,000,000
Loss on extinguishment of debt	$ 11,200,000
Term Loan \| New Term Loan Agreement \| Premium Until First Anniversary Date
Debt Instrument [Line Items]
Prepayment premium, percent	3.00%
Term Loan \| New Term Loan Agreement \| Premium From First Anniversary Date Until Second Anniversary Date
Debt Instrument [Line Items]
Prepayment premium, percent	2.00%
Term Loan \| New Term Loan Agreement \| Premium From Second Anniversary Date Until Third Anniversary Date
Debt Instrument [Line Items]
Prepayment premium, percent	1.00%
Term Loan \| New Term Loan Agreement \| Premium Thereafter
Debt Instrument [Line Items]
Prepayment premium, percent	0.00%
ABL Facility \| Minimum \| 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Interest rate			1.75%
ABL Facility \| 2014 Financing
Debt Instrument [Line Items]
Principal amount issued						450,000,000
ABL Facility \| 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Annual limit on capital expenditures			$ 210,600,000
Line of credit facility, total cash and availability			$ 37,700,000
ABL Facility \| 2014 ABL Facility Credit Agreement \| Minimum
Debt Instrument [Line Items]
Annual limit on capital expenditures	$ 200,000,000
2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
2014 ABL Facility Credit Agreement \| ABL Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.75%
2014 ABL Facility Credit Agreement \| 2014 Financing
Debt Instrument [Line Items]
Principal amount issued						$ 450,000,000