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Loss Reserves - Default Inventory Reconciliation (Details) - loan | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Primary Default Inventory [Roll Forward] |  |  |
Delinquent inventory at beginning of year | 50,282 | 62,633 | 79,901
New Notices | 68,268 | 67,434 | 74,315
Cures | (61,094) | (65,516) | (73,610)
Paids (including those charged to a deductible or captive) | (9,206) | (12,367) | (16,004)
Rescissions and denials | (357) | (629) | (848)
Other items removed from inventory | (1,337) | (1,273) | (1,121)
Delinquent inventory at end of year | 46,556 | 50,282 | 62,633

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- Definition The number of loans in the primary default inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventory
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Deductions from the primary default inventory resulting from loans in default being brought current. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryCures
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Additions to the primary default inventory resulting from new notices of defaulted loans. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryNewNotices
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Other deductions from the primary default inventory, including items removed for settlements + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryOtherItemsRemoved
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Deductions from the primary default inventory resulting from claims being paid, including those charged to a deductible or captive. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryPaids
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Deductions from the primary default inventory resulting from rescissions and denials. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryRescissionsAndDenials
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryRollForward
Namespace Prefix: | mtg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration