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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Total commitments to originate loans	$ 1,800.0	$ 821.9
Total commitments related to derivatives	1,900.0	933.9
Reverse mortgage loans borrowers	116.9	107.3
Short-term commitments to lend	$ 2.3	$ 0.3

X

- Definition

Commitments to fund derivatives.

+ References

No definition available.

+ Details

Name:	ghld_CommitmentsToFundDerivatives
Namespace Prefix:	ghld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments to purchase and fund mortgage loans.

+ References

No definition available.

+ Details

Name:	ghld_CommitmentsToPurchaseAndFundMortgageLoans
Namespace Prefix:	ghld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments To Purchase Reverse Mortgage Loans Borrowers, Additional Borrowing capacity

+ References

No definition available.

+ Details

Name:	ghld_CommitmentsToPurchaseReverseMortgageLoansBorrowersAdditionalBorrowingCapacity
Namespace Prefix:	ghld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Short-term Commitments To Lend

+ References

No definition available.

+ Details

Name:	ghld_ShortTermCommitmentsToLend
Namespace Prefix:	ghld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration