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Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
RelatedPartyTransactionsDisclosureTextBlockAbstract
Equity Method Investment, Ownership Percentage	29.00%
Revenue from Related Parties	$ 144us-gaap_RevenueFromRelatedParties	$ 147us-gaap_RevenueFromRelatedParties	$ 149us-gaap_RevenueFromRelatedParties
Due from Related Parties	$ 13us-gaap_DueFromRelatedParties	$ 13us-gaap_DueFromRelatedParties	$ 16us-gaap_DueFromRelatedParties

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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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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