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Retirement Benefits - Participation in Multiemployer Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 2,149	$ 1,829	$ 1,706
Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	15,679	16,265	14,876
Pension Trust Fund for Operating Engineers Pension Plan | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	2,283	2,278	2,314
Heavy And General Construction Laborers Local 472 and Local 172 | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	1,915	1,957	1,535
International Union Of Operating Engineers Local 825 | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	1,298	1,755	1,671
Carpenter Funds Administrative Office | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	887	915	547
Laborers Pension Trust For Northern California | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	818	787	857
Cement Mason Pension Trust Fund For Northern California | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	428	426	320
All other funds | Multiemployer Plans, Pension
Defined Contribution Plan Disclosure [Line Items]
Contributions	$ 8,050	$ 8,147	$ 7,632
Red Zone
Defined Contribution Plan Disclosure [Line Items]
Multiemployer plan, collective-bargaining arrangement, percentage of contributions required for multiple collective-bargaining arrangements	65.00%
Orange Zone
Defined Contribution Plan Disclosure [Line Items]
Multiemployer plan, collective-bargaining arrangement, percentage of contributions required for multiple collective-bargaining arrangements	80.00%
Yellow Zone
Defined Contribution Plan Disclosure [Line Items]
Multiemployer plan, collective-bargaining arrangement, percentage of contributions required for multiple collective-bargaining arrangements	80.00%
Green Zone
Defined Contribution Plan Disclosure [Line Items]
Multiemployer plan, collective-bargaining arrangement, percentage of contributions required for multiple collective-bargaining arrangements	80.00%

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

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Percentage of employer contribution required by collective-bargaining arrangement (CBA) to total contribution from all participating employers in multiemployer pension plan determined to be individually significant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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