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Service Agreements and Related Party Transactions (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Mar. 19, 2012 Contract
Service Agreements and Related Party Transactions (Textual) [Abstract] |  |
Number of agreements |  | 2
Expenses incurred under the agreements | $ 560 |
Description of Fee |  | Fee equal to the product of (x) the ending dollar amount of assets under management during the calendar month in question and (y) .002 divided by 12
Administrative services agreement fee |  | $ 110

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Description of fee. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of agreements. + References No definition available. + Details
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Namespace Prefix: | wmi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related party Transaction administrative services agreement fee. + References No definition available. + Details
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Namespace Prefix: | wmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: | wmi_
Data Type: | xbrli:stringItemType
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Period Type: | duration