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Related Party - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	2 Months Ended	12 Months Ended
	Feb. 29, 2012	Feb. 28, 2012	Dec. 31, 2011
Statement Of Partners Capital [Abstract]
Public offering common stock shares	3,597,333
Non-voting common stock repurchased	1,821,730
Revenue generated by related party		$ 1.6	$ 7.5

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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