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Shareholders' equity - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2007	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2012
Shareholders Equity [Line Items]
Common shares, authorized		200,000,000us-gaap_CommonStockSharesAuthorized
Common shares, par value		$ 1	$ 1
Preference shares, authorized		500,000us-gaap_PreferredStockSharesAuthorized
Repurchase of outstanding common stock, authorized amount	$ 300,000,000
Per share market price of common stock		$ 61.32us-gaap_SharePrice
Strike price of warrants		$ 74.65invest_InvestmentWarrantsExercisePrice		$ 74.65invest_InvestmentWarrantsExercisePrice
Conversion of convertible notes, shares issued upon conversion		1,900,000	600,000	7,981,422
Convertible senior notes percentage		3.875%	3.875%		3.875%
Stock Option
Shareholders Equity [Line Items]
Weighted average antidilutive which were not included in the calculation of earnings per share		6,300,000	7,700,000		9,000,000
Convertible Note
Shareholders Equity [Line Items]
Weighted average antidilutive which were not included in the calculation of earnings per share		2,700,000	1,600,000		300,000