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Note 19 - Statutory Information Combined Risk-to-Capital Ratio and Other Mortgage Insurance Subsidiaries (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) subsidiaries	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Risk To Capital Ratio	12.8	12.1
Number of Subsidiaries | subsidiaries	5
Radian Insurance
RIF, net	$ 15.0
Other MI Companies
Statutory Accounting Practices, Statutory Net Income Amount	(2.8)	$ 0.1	$ (6.1)
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	58.0	58.6	57.1
Contingency Reserve	$ 1.7	$ 1.7	$ 1.5

X

- Definition

Funds separated from retained earnings and held to cover any unforeseen future business losses.

+ References

No definition available.

+ Details

Name:	rdn_ContingencyReserve
Namespace Prefix:	rdn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) net of risk ceded through reinsurance contracts and net of risk in force on defaulted loans.

+ References

No definition available.

+ Details

Name:	rdn_NetRiskInForce
Namespace Prefix:	rdn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of Subsidiaries

+ References

No definition available.

+ Details

Name:	rdn_NumberofSubsidiaries
Namespace Prefix:	rdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This concept represents an entity's ratio of net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) to the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves).

+ References

No definition available.

+ Details

Name:	rdn_RiskToCapitalRatio
Namespace Prefix:	rdn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

+ Details

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

X

- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

X

- Details

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

X

- Details

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