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Impact on the results of operations of transactions between the Corporation and PRLP 2011 Holdings, LLC (Detail) (Interest Income Member, 100%, Prlp2011 Holdings Llc Joint Venture [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income Member \| 100% \| Prlp2011 Holdings Llc Joint Venture [Member]
Related Party Transaction [Line Items]
Related Party Transaction Revenues From Transactions With Related Party	$ 266	$ 619	$ 940	$ 2,130

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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