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Principles of Consolidation and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 Segment
Organization And Basis Of Presentation [Line Items]
Date of incorporation	Mar. 09, 2010
State of incorporation	Ireland
Kind of listing	A ordinary shares
Number of business segments	3

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State or Country Name where an entity is incorporated

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Description of the kind of listing the entity has on the exchange, if necessary to further describe different instruments that are already distinguished by Entity, Exchange and Security.

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Organization And Basis Of Presentation [Line Items]

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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