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Organization and basis of presentation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	9 Months Ended
	May 31, 2012	Sep. 30, 2012
Controlling interest in subsidiary		95.00%
Authorized number of shares of our common stock		500
Stock split in the form of a stock dividend	3-for-1
Additional paid in capital to common stock due to stock split		$ 2.4
Per share value of common stock after stock split		$ 0.01

Aggregate adjustment to additional paid in capital for stock to account for a stock split in the case where the per-share par value or stated value is not reduced or increased proportionately such that the total par value or stated value remains the same for all shares.

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- 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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