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Income taxes - reconciliations between statutory federal income tax rate and effective income tax rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Tax effect of international items	(27.50%)	(28.40%)	(22.60%)
State taxes, net of federal benefit	0.90%	(0.70%)	2.10%
Uncertain tax contingencies	(3.60%)	(1.90%)	(0.80%)
Contingent consideration reversals	(1.20%)	(0.70%)	(1.20%)
Other, net	(0.30%)	(0.10%)	0.50%
Effective income tax rate, total	3.30%	3.20%	13.00%

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Effective income tax rate reconciliation contingent consideration reversals.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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