XML 34 R31.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Insurance Activity - Components of Liability for Losses and Loss Adjustment Reserves (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Effects of Reinsurance [Line Items] |  |  |
Total losses and loss adjustment reserves | $ 7,308 | $ 18,947 | $ 44,314
Case-basis reserves [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Total losses and loss adjustment reserves | 5,135 | 16,538 |
IBNR reserves [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Total losses and loss adjustment reserves | 97 | 110 |
Premium deficiency reserves [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Total losses and loss adjustment reserves | $ 2,076 | $ 2,299 |

X
- 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_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis=wmih_CaseBasisReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis=wmih_IbnrReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis=wmih_PremiumDeficitReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |