Number of placements for reinsurance programs.

No definition available.

Name:	prch_ReinsuranceProgramNumberOfPlacements
Namespace Prefix:	prch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of retention layers for reinsurance policy.

+ References

No definition available.

+ Details

Name:	prch_ReinsuranceRetentionPolicyNumberOfRetentionLayers
Namespace Prefix:	prch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount per event of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

+ Details

Name:	us-gaap_ReinsuranceRetentionAmountRetainedPerEvent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount per event of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

+ Details

Name:	us-gaap_ReinsuranceRetentionExcessRetentionAmountReinsuredPerEvent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Percentage of risk undertaken originally by insurer ceded to reinsurer.

+ References

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyReinsuredRiskPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ProductOrServiceAxis=prch_ReinsuranceQuotaShareProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=prch_CoastalLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=prch_CoreLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=prch_ReinsurancePropertyCatastropheTreatiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=prch_ReinsurancePropertyNonWeatherLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Reinsurance - Additional information (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) item	Dec. 31, 2022 USD ($) item	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 item
Reinsurance Quota Share Program [Member]
Reinsurance Retention Policy [Line Items]
Number of placements for reinsurance programs \| item		2	2	2
Reinsurance Quota Share Program [Member] \| Coastal Locations [Member]
Reinsurance Retention Policy [Line Items]
Reinsured risk percentage			61.75%	90.00%
Reinsurance Quota Share Program [Member] \| Core Locations [Member]
Reinsurance Retention Policy [Line Items]
Reinsured risk percentage			90.00%	90.00%
Reinsurance Property Catastrophe Treaties [Member]
Reinsurance Retention Policy [Line Items]
Number of retention layers for reinsurance policy \| item	4	5	5	3
Excess amount retained		$ 336
Amount retained	$ 2	$ 4
Reinsurance Property Non-weather Losses [Member]
Reinsurance Retention Policy [Line Items]
Excess amount retained			$ 500
Reinsurance Property Non-weather Losses [Member] \| Coastal Locations [Member]
Reinsurance Retention Policy [Line Items]
Amount retained			191
Reinsurance Property Non-weather Losses [Member] \| Core Locations [Member]
Reinsurance Retention Policy [Line Items]
Amount retained			$ 50