Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-2

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and contingencies - Additional Information (Detail) $ in Thousands	Mar. 06, 2024 business_unit	Dec. 31, 2023 USD ($) lawsuit claim	Dec. 31, 2022 USD ($)
Commitments Disclosure [Line Items]
Estimated insurance recoveries \| $		$ 66,000	$ 0
Mountain View Fire
Commitments Disclosure [Line Items]
Number of active lawsuits		21
Number of non-litigation claims \| claim		1
Number of lawsuits filed by groups of individual plaintiffs		14
Number of wrongful death lawsuits		1
Number of lawsuits filed by insurance companies		6
Accrued estimated losses \| $		$ 66,000
Estimated insurance recoveries \| $		$ 66,000
Mountain View Fire \| Subsequent Event
Commitments Disclosure [Line Items]
Number of bellwether cases \| business_unit	4