Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Loan loss reserves	$ 4.3	$ 5.0
Construction loan joint venture [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Impairment charge		$ 1.6

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Provision charged for the period based on estimated losses to be realized from loan and lease transactions.

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