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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 357,746	$ 438,986	$ 413,397
Add: claims expense accrual
Current period	75,786	147,097	161,691
Prior periods	(9,225)	(6,383)	(13,355)
Total expense accrual	66,561	140,714	148,336
Less: claim payments related to
Current period	15,063	22,877	24,414
Prior periods	129,138	198,620	98,445
Total paid	144,201	221,497	122,859
Change in claims incurred in excess of retention limits	(699)	(457)	112
Workers' compensation claims liabilities, Ending balance	279,407	357,746	438,986
Incurred but not reported (IBNR)	$ 153,838	$ 210,798	$ 285,191
Ratio of IBNR to workers' compensation claims liabilities	55.00%	59.00%	65.00%

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- Definition

Claim payments.

+ References

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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.

+ References

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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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- Definition

Workers compensation expense adjustments accrual claims for prior periods.

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- Definition

Workers compensation incurred but not reported.

+ References

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- Definition

Workers compensation percent to liabilities incurred but not reported.

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- Definition

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 http://asc.fasb.org/extlink&oid=120398452&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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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