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Related Party Transactions - 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
Related Party Transaction Due From To Related Party [Line Items]
Revenue from contracts with affiliated entities	$ 10.6	$ 7.2	$ 35.7	$ 10.0
Fees from contracts with affiliated entities	0.3	0.9	1.1	1.0
Distributions payable to the owners					$ 0.5

Amounts due to recorded owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company.

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- Definition

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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