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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]
Revenue from contracts with affiliated entities	$ 1.1	$ 10.6	$ 5.0	$ 35.7
Fees from contracts with affiliated entities		0.3	0.3	1.1
Maximum [Member]
Related Party Transaction [Line Items]
Fees from contracts with affiliated entities	$ 0.1

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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