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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 438,986	$ 413,397	$ 363,517
Add: claims expense accrual
Current period	147,097	161,691	162,525
Prior periods	(6,383)	(13,355)	(3,846)
Total expense accrual	140,714	148,336	158,679
Less: claim payments related to
Current period	22,877	24,414	23,444
Prior periods	198,620	98,445	85,603
Total paid	221,497	122,859	109,047
Change in claims incurred in excess of retention limits	(457)	112	248
Workers' compensation claims liabilities, Ending balance	357,746	438,986	413,397
Incurred but not reported (IBNR)	$ 210,798	$ 285,191	$ 260,529
Ratio of IBNR to workers' compensation claims liabilities	59.00%	65.00%	63.00%

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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

No definition available.

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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.

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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
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(a))
-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
-Subparagraph (SX 210.5-02(20))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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