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Subsequent Events - Additional Information (Detail) (Subsequent Events [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 03, 2014
Subsequent Event [Line Items]
Debt amount percentage	13.00%
United Guaranty [Member]
Subsequent Event [Line Items]
Amount paid by UGRIC	$ 17.7
WMMRC [Member]
Subsequent Event [Line Items]
Amount paid by UGRIC	$ 65.4

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount Paid To Third Party Under Commutation Agreement

+ References

No definition available.

+ Details

Name:	wmih_AmountPaidToThirdPartyUnderCommutationAgreement
Namespace Prefix:	wmih_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration