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Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Significant Accounting Policies (Textual) [Abstract] |  |
Premium deficiency reserves | $ 12.8 | $ 3.1

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- Definition Premium deficiency reserves. + References No definition available. + Details
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Namespace Prefix: | wmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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