Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Domestic and foreign components of income before income taxes
United States	$ 133,564	$ 140,307	$ 140,346
Foreign	25,722	11,550	5,293
Income before provision for income taxes	159,286	151,857	145,639
Current provision
Federal	5,412	3,678	37,315
State	2,117	4,471	6,680
Foreign	4,041	2,405	1,741
Total	11,570	10,554	45,736
Deferred provision (benefit)
Federal	12,645	22,607	(3,207)
State	(428)	2,372	(1,064)
Foreign	2,478	585	(809)
Total	14,695	25,564	(5,080)
Total	$ 26,265	$ 36,118	$ 40,656
Reconciliation of income tax expense compared to the amount of income tax expense that would result by applying U.S. federal statutory income tax rate to pre-tax income
U.S. federal statutory income tax rate (as a percent)	21.00%	21.00%	21.00%
State taxes, net of federal income tax impact (as a percent)	0.80%	3.90%	3.10%
Tax credits (as a percent)	(1.90%)	(1.10%)	(0.80%)
Income taxed at rates greater than U.S. (as a percent)	0.60%	0.20%	0.20%
Nondeductible meals & entertainment (as a percent)	0.50%	0.20%	3.30%
Nondeductible compensation (as a percent)	0.40%	0.30%	0.30%
Capital loss utilization - release of valuation allowance	(5.80%)	0.00%	0.00%
Other items (as a percent)	0.90%	(0.70%)	0.80%
Effective tax rate (as a percent)	16.50%	23.80%	27.90%
Deferred tax assets:
Accrued compensation	$ 9,685	$ 4,178
Accrued workers compensation	2,949	3,252
Net operating losses	46,843	36,517
Capital loss carryforward		9,776
Lease liabilities	36,372	30,461
Insurance reserves	5,200	4,555
Loss reserves	1,555	2,163
Tax credit	1,069	1,540
Deferred payroll tax		5,404
Prepaid expenses and other	1,963
Capitalized research	5,127
Other	1,447	2,394
Total deferred tax assets	112,210	100,240
Deferred tax liabilities
Depreciation and amortization	(119,081)	(84,371)
Prepaid expense and other	(285)	(796)
Lease assets	(36,865)	(31,069)
Total deferred tax liabilities	(156,231)	(116,236)
Valuation allowance	(13,080)	(21,207)
Net deferred tax liabilities	(57,101)	(37,203)
Net operating loss carryforward	450,600
Change in valuation allowance	$ (8,100)
Expiration period for state net operating loss carryforwards (in years)	20 years
Capital loss carryforward	$ 1,100
Reasonably possible decrease in unrecognized tax benefits	$ 200
Minimum period of statute of limitations of state and foreign jurisdictions	3 years
Maximum period of statute of limitations of state and foreign jurisdictions	5 years
Deferred FICA tax payments reserve	$ 21,700	42,100
Income Taxes Receivable	6,300
Deferred Tax Assets, Net of Valuation Allowance	112,210	100,240
Tax Credit Carryforward, Amount	1,100
Reconciliation and aggregate changes for unrecognized tax benefits
Beginning balance	1,337	1,553	$ 815
Increases in balances for tax positions taken during the current year	120	288	377
Increases in balances for tax positions taken during prior years	9,204	83	717
Settlements and effective settlements with tax authorities		(416)	(158)
Lapse of statute of limitations	(465)	(171)	(198)
Total	$ 10,196	$ 1,337	$ 1,553
Canada
Reconciliation of income tax expense compared to the amount of income tax expense that would result by applying U.S. federal statutory income tax rate to pre-tax income
U.S. federal statutory income tax rate (as a percent)	23.00%
Minimum
Deferred tax liabilities
Tax Credit Carry Forward, Expiration Period	10 years
Maximum
Deferred tax liabilities
Tax Credit Carry Forward, Expiration Period	20 years