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Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 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 + Details
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