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Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Segment	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2us-gaap_NumberOfOperatingSegments
Net foreign exchange losses resulting from foreign currency transactions included in other income	$ 6	$ 39

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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