Description of Business and Summary of Accounting Policies - Additional Information (Detail)		1 Months Ended	12 Months Ended			36 Months Ended
	Mar. 01, 2018 USD ($)	Aug. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) Segment Customer	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)
Description of Business and Summary of Significant Accounting Policies [Line Items]
Number of operating segments | Segment			1
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2021	Jan. 01, 2020		Jan. 01, 2021
Change in accounting principle, accounting standards update, adopted			true	true		true
Change in accounting principle, accounting standards update, immaterial effect			true	true		true
Accounting Standards Update [Extensible Enumeration]			us-gaap:AccountingStandardsUpdate201912Member	us-gaap:AccountingStandardsUpdate201613Member
Depreciation and amortization			$ 141,700,000	$ 134,655,000	$ 119,135,000
Primary payroll-related costs capitalized			$ 1,000,000.0	800,000	1,500,000
Stock-based awards compensation expense amortization period			3 years
Advertising costs			$ 5,700,000	4,600,000	6,100,000
Credit Concentration Risk [Member] | Accounts Receivable [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Number of customers | Customer			0
Credit Concentration Risk [Member] | Accounts Receivable [Member] | No Single Customer [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Percentage of accounts receivable			5.00%
Restricted Stock [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Stock-based awards compensation expense amortization period			3 years
New Automobile Liability Insurance Policy [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
New automobile liability insurance policy, effective date	Mar. 01, 2018
New automobile liability insurance policy, term	3 years
Risk retention amount per occurrence under new policy	$ 2,000,000.0
Provisional extended term of policy	1 year
Maximum amount received return on premium availability		$ 5,200,000
Self insurance, per occurrence		$ 10,000,000
Reduction in insurance premium expenses			$ 1,500,000			$ 1,500,000
Accrued additional premium			0			0
Property and Equipment [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Depreciation and amortization			140,500,000	133,500,000	$ 117,900,000
Trailers [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Assets acquired under finance lease, gross			137,900,000	138,000,000.0		137,900,000
Assets acquired under finance lease, accumulated depreciation			$ 49,400,000	$ 40,100,000		$ 49,400,000
Minimum [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Percentage of revenue derived from transporting			97.00%
Average transit time			1 day
Minimum [Member] | Restricted Stock [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Stock-based awards compensation expense amortization period			3 years
Minimum [Member] | New Automobile Liability Insurance Policy [Member] | Entire 36 Months [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Returnable premium for changes in claims	$ 15,600,000
Maximum [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Average transit time			5 days
Maximum [Member] | Restricted Stock [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Stock-based awards compensation expense amortization period			5 years
Maximum [Member] | New Automobile Liability Insurance Policy [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Single loss limit	8,000,000.0
Aggregate loss limit for each policy year	24,000,000.0
Aggregate loss limit during policy period	48,000,000.0
Paid losses specified limit to pay additional premium	15,600,000
Additional premium to be paid, if losses are paid by insurer are greater than limit specified	11,000,000.0
Maximum [Member] | New Automobile Liability Insurance Policy [Member] | First 12 months [Member]
Description of Business and Summary of Significant Accounting Policies [Line Items]
Returnable premium for changes in claims	$ 5,200,000