Financing Arrangements - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended
	Jan. 30, 2014	Sep. 30, 2014	Jan. 30, 2014 Maximum [Member]	Sep. 30, 2014 Tranche A and Tranche A-1 Term Loan [Member]	Dec. 31, 2013 Tranche A and Tranche A-1 Term Loan [Member]	Sep. 30, 2014 Tranche B Term Loan [Member]	Dec. 31, 2013 Tranche B Term Loan [Member]	Jan. 30, 2014 7.50% Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal available			$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 100,000,000	$ 100,000,000	$ 150,000,000
Loans outstanding				0	0	0	0
Interest rate on debt								7.50%
Subordinate note issuance terms and conditions		Subordinated Notes may be issued by WMIHC, at WMIHC’s option, in one or more tranches over a three year period, subject to certain terms and conditions, including the conditions that (i) all or substantially all of the proceeds from the issuance of the Subordinated Notes are used by WMIHC to fund the acquisition of the assets of, or equity interests of, or a business line, unit or division of, any entity that has been approved by the Board, (ii) no defaults or events of default shall have occurred under the Note Purchase Agreement and (iii) no violation of certain provisions of the Investor Rights Agreement shall have occurred. KKR Management may refuse to purchase Subordinated Notes from WMIHC in the event that a third party (other than KKR or any of its affiliates) (i) has completed a successful proxy contest against WMIHC or (ii) has publicly initiated or threatened to initiate a proxy contest and, in connection therewith, such third party is granted the right to designate more than one nominee to the Board. Upon such refusal, KKR Management will automatically forfeit a percentage of warrants
Maximum percentage of borrowing available on tangible assets	25.00%
Debt instrument maturity description		Each Subordinated Note will mature on the date that is seven years from the date that the initial Subordinated Note is first issued (the “Initial Issue Date”).
Debt instrument maturity period	7 years
Due interest on note		Interest on the Subordinated Notes is due semi-annually
Prior maturity date subordinate note redemption percentage		100.00%
Notes outstanding		$ 0