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Commitments and Contingencies - Additional Information (Details) $ in Millions	Sep. 30, 2021 USD ($) Home
Commitments And Contingencies Disclosure [Abstract]
Contract to purchase homes | Home	415
Aggregate purchase price | $	$ 140.0

X

- Definition

Contractual obligation to purchase home.

+ References

No definition available.

+ Details

Name:	opad_ContractualObligationToPurchaseHome
Namespace Prefix:	opad_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant