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Shareholders' and Member's Equity - Schedule of Cancellations of Share (Details) - shares	3 Months Ended			12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025
Class B Shares | LandBridge
Shareholders' and Member's Equity [Line Items]
Number of opco units cancelled	119,987	79,686	34,674	234,347

X

- Definition

Number of opco units cancelled.

+ References

No definition available.

+ Details

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Namespace Prefix:	lb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shareholder's and Member's Equity.

+ References

No definition available.

+ Details

Name:	lb_ShareholdersAndMembersEquityLineItems
Namespace Prefix:	lb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lb_LandbridgeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: