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Loss Reserves - Aging of Primary Default Inventory and Number of Delinquent Payments (Details) - loan | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Aging of the Primary Default Inventory [Abstract] |  |  |  |
3 months or less | 12,194 | 13,053 | 15,319 |
3 months or less (in hundredths) | 24.00% | 21.00% | 19.00% |
4 - 11 months | 13,450 | 15,763 | 19,710 |
4 - 11 months (in hundredths) | 27.00% | 25.00% | 25.00% |
12 months or more | 24,638 | 33,817 | 44,872 |
12 months or more (in hundredths) | 49.00% | 54.00% | 56.00% |
Total primary default inventory | 50,282 | 62,633 | 79,901 | 103,328
Total primary default inventory (in hundredths) | 100.00% | 100.00% | 100.00% |
Primary claims received inventory included in ending default inventory | 1,385 | 2,769 | 4,746 |
Primary claims received inventory included in ending default inventory (in hundredths) | 3.00% | 4.00% | 6.00% |
Number of Payments Delinquent [Abstract] |  |  |  |
3 payments or less | 18,419 | 20,360 | 23,253 |
3 payments or less (in hundredths) | 36.00% | 33.00% | 29.00% |
4 - 11 payments | 12,892 | 15,092 | 19,427 |
4 - 11 payments (in hundredths) | 26.00% | 24.00% | 24.00% |
12 payments or more | 18,971 | 27,181 | 37,221 |
12 payments or more (in hundredths) | 38.00% | 43.00% | 47.00% |
Total primary default inventory | 50,282 | 62,633 | 79,901 | 103,328
Total primary default inventory (in hundredths) | 100.00% | 100.00% | 100.00% |

X
- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

X
- Definition The number of loans in the primary default inventory that have been delinquent for twelve payments or more. + References No definition available. + Details
Name: | mtg_NumberOfPaymentsDelinquent12PaymentsOrMore
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
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Period Type: | instant

X
- Definition The percentage of loans in the primary default inventory that have been delinquent for twelve payments or more. + References No definition available. + Details
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Namespace Prefix: | mtg_
Data Type: | num:percentItemType
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- Definition The number of loans in the primary default inventory that have been delinquent for three payments or less. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of loans in the primary default inventory that have been delinquent for three payments or less. + References No definition available. + Details
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Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of loans in the primary default inventory that have been delinquent for at least four payments but no more than eleven payments. + References No definition available. + Details
Name: | mtg_NumberOfPaymentsDelinquent4To11Payments
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of loans in the primary default inventory that have been delinquent for at least four payments but no more than eleven payments. + References No definition available. + Details
Name: | mtg_NumberOfPaymentsDelinquent4To11PaymentsPercentage
Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | mtg_NumberOfPaymentsDelinquentAbstract
Namespace Prefix: | mtg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The number of loans in the primary default inventory that are in the claims received inventory. + References No definition available. + Details
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Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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- Definition The percentage of loans in the primary default inventory that are in the claims received inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryClaimsReceivedInventoryPercentage
Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of loans that have been in the primary default inventory for at least four months but no greater than eleven months as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryFourToElevenMonths
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of loans that have been in the primary default inventory for at least four months but no greater than eleven months as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryFourToElevenMonthsPercentage
Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of loans in the primary default inventory. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryPercentage
Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of loans that have been in the primary default inventory for three months or less as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryThreeMonthsOrLess
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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- Definition The percentage of loans that have been in the primary default inventory for three months or less as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryThreeMonthsOrLessPercentage
Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of loans that have been in the primary default inventory for twelve months or more as of the balance sheet date. + References No definition available. + Details
Name: | mtg_PrimaryDefaultInventoryTwelveMonthsOrMore
Namespace Prefix: | mtg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of loans that have been in the primary default inventory for twelve months or more as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | mtg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant