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Organization and basis of presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013
Basis Of Presentation And Significant Accounting Policies [Line Items]
Common stock split	3-for-1 split
Contran [Member]
Basis Of Presentation And Significant Accounting Policies [Line Items]
Controlling interest in subsidiary	93.00%

- Definition

Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

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