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Commercial Mortgage Banking - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Servicing Liability at Amortized Cost [Line Items]
Company owned OMHHF	83.68%		83.68%
Prepayment costs	$ 2.8	$ 4.3	$ 13.5	$ 5.9
Custodial escrow accounts	272.4		272.4		242.7
Uninsured balance relation to escrow accounts	176.8		176.8
Servicing rights are amortized using straight-line method			10 years
Mortgage Servicing Rights [Member]
Servicing Liability at Amortized Cost [Line Items]
Fair value of servicing rights	38.5		38.5		33.0
Carrying value of loan servicing rights	$ 28.1		$ 28.1		$ 27.0
OMHHF [Member]
Servicing Liability at Amortized Cost [Line Items]
Company owned OMHHF	83.68%		83.68%
Non-controlling interest	16.32%		16.32%
Number of related party			1

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Majority interest ownership percentage by parent.

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Percentage owned by non-controlling interest.

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Number of related party.

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- Definition

Prepayment penalty charges.

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- Definition

Servicing asset at carrying amount.

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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