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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 279,407	$ 357,746	$ 438,986
Add: claims expense accrual
Current period	19,146	75,786	147,097
Prior periods	(11,337)	(9,225)	(6,383)
Total expense accrual	7,809	66,561	140,714
Less: claim payments related to
Current period	4,450	15,063	22,877
Prior periods	67,581	129,138	198,620
Total paid	72,031	144,201	221,497
Change in claims incurred in excess of retention limits	802	(699)	(457)
Workers' compensation claims liabilities, Ending balance	215,987	279,407	357,746
Incurred but not reported (IBNR)	$ 110,824	$ 153,838	$ 210,798
Ratio of IBNR to workers' compensation claims liabilities	51.00%	55.00%	59.00%

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- Definition

Claim payments.

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- Definition

Claim payments prior period.

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- Definition

Claims expense accrual.

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- Definition

Workers compensation change in claims incurred in excess of retention limits.

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- Definition

Workers compensation claim payments.

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- Definition

Workers compensation claim payments current period.

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- Definition

Workers compensation expense accrual claims.

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- Definition

Workers compensation expense accrual claims for current period.

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Workers compensation expense adjustments accrual claims for prior periods.

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- Definition

Workers compensation incurred but not reported.

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Workers compensation percent to liabilities incurred but not reported.

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workers compensation reserve.

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- Definition

Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02(24))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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