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Note 14 - Statutory Information Risk To Capital Calculation (Details) (Radian Guaranty [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Radian Guaranty [Member] |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Risk to Capital Ratio, Entity's Intended Maximum | 20 |  |  |
Risk In Force | $ 28,287.9 | [1] | $ 26,128.2 | [1]
Statutory surplus | 1,315.5 |  | 1,317.8 |
Statutory contingency reserve | 196.0 |  | 23.0 |
Statutory position | $ 1,511.5 |  | $ 1,340.8 |
Risk-to-capital | 18.7 |  | 19.5 |
[1] | Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.

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

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- 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

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- Details
Name: | rdn_RiskToCapitalLineItemsLineItems
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
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Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents an entity's intended ceiling for its risk to capital ratio which is the net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) divided by the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves). + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
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- Definition Statutory Accounting Practices, Statutory Policyholders' Surplus, Balance + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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Balance Type: | credit
Period Type: | instant