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Long-Term Debt (Details) - USD ($)		12 Months Ended
	Sep. 13, 2017	Dec. 31, 2019	Dec. 31, 2018
Long-term Debt [Abstract]
Senior Notes outstanding		$ 1,375,016,000	$ 1,417,392,000
Total debt outstanding, Fair value		1,421,325,000	1,411,628,000
Long-term debt		1,369,767,000	1,410,188,000
Senior Notes Due March 1, 2028 [Member]
Long-term Debt [Abstract]
Long term debt, face amount		500,000,000
Periodic payment, interest		10,500,000
Cash proceeds received		495,019,000
Original issue discount		705,000
Debt issuance costs		4,276,000
Senior Notes outstanding		$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage		4.20%
Maturity Date		Mar. 01, 2028
Senior Notes Series A Due February 27, 2020 [Member]
Long-term Debt [Abstract]
Long term debt, face amount		$ 150,000,000
Senior Notes outstanding		$ 150,000,000	150,000,000
Debt instrument, interest rate, stated percentage		2.72%
Maturity Date		Feb. 27, 2020
Senior Notes Series B Due February 27, 2023 [Member]
Long-term Debt [Abstract]
Long term debt, face amount		$ 350,000,000
Senior Notes outstanding		$ 350,000,000	$ 350,000,000
Debt instrument, interest rate, stated percentage		3.29%
Maturity Date		Feb. 27, 2023
Term Loan Due September 15, 2032 [Member] | Stewart & Stevenson LLC [Member]
Long-term Debt [Abstract]
Term debt assumed, paid off	$ 12,135,000
Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Maximum borrowing capacity		$ 850,000,000
Credit facility, expiration date		Mar. 27, 2024
Credit facility, amount outstanding		$ 0
Debt instrument, interest rate, stated percentage		2.90%
Letter of Credit [Member]
Long-term Debt [Abstract]
Credit facility, amount outstanding		$ 5,258,000
Senior Notes [Member]
Long-term Debt [Abstract]
Long term debt, face amount		500,000,000
Line Of Credit [Member]
Long-term Debt [Abstract]
Maximum borrowing capacity		$ 10,000,000
Credit facility, expiration date		Jun. 30, 2021
Credit facility, amount outstanding		$ 1,171,000
Secured Debt [Member]
Long-term Debt [Abstract]
Short-term debt		$ 16,000,000

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to interest.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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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