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Share Capital - Changes in Number of Shares of Class Stock Outstanding (Detail) (Class A Stock [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Class A Stock [Member]
Dividends Payable [Line Items]
Class A Stock outstanding, beginning of period	13,489,162	13,568,945	13,572,265	13,268,522
Issued pursuant to the share-based compensation plans	40,850	2,000	57,647	302,423
Repurchased and cancelled pursuant to the stock buy-back	(15,000)		(114,900)
Class A Stock outstanding, end of period	13,515,012	13,570,945	13,515,012	13,570,945

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Number of share instruments newly issued under a share-based compensation plan.