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Shareholders' Equity - Additional Information (Detail) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Shareholders Equity [Line Items]
Shares repurchased	0	0
Ordinary Shares A | Treasury Shares
Shareholders Equity [Line Items]
A ordinary shares purchased			11,895	5,444	5,444
Stock repurchase program, price per share of shares purchased			$ 28.03	$ 25.46

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Shareholders Equity [Line Items]

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Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Number 210



-Section 04



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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



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-Topic 505



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-Section 50



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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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