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Related Party Transactions (Schedule of Transactions Recognized ) (Detail) (O V S [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
O V S [Member]
Related Party Transaction [Line Items]
Revenues	$ 1,700	$ 1,700	$ 3,400	$ 3,400	$ 7,029	$ 6,639	$ 6,467
Operating costs	$ (400)	$ (400)	$ (700)	$ (800)	$ (1,627)	$ (1,515)	$ (2,675)

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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