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Shareholders' equity - change in accumulated other comprehensive income (loss), net of tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, accumulated other comprehensive income (loss), net of tax	$ (371,124)	$ (260,895)
Other comprehensive income (loss) before reclassifications	(74,774)	(114,845)
Amounts reclassified from accumulated other comprehensive income (loss)	8,013	4,616
Net current-year other comprehensive income (loss)	(66,761)	(110,229)
Acquisition of noncontrolling interest	(832)
Ending balance, accumulated other comprehensive income (loss), net of tax	(438,717)	(371,124)
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, accumulated other comprehensive income (loss), net of tax	(2,491)	0
Other comprehensive income (loss) before reclassifications	(3,434)	(2,974)
Amounts reclassified from accumulated other comprehensive income (loss)	3,501	483
Net current-year other comprehensive income (loss)	67	(2,491)
Acquisition of noncontrolling interest	0
Ending balance, accumulated other comprehensive income (loss), net of tax	(2,424)	(2,491)
Pension and Other Postretirement Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, accumulated other comprehensive income (loss), net of tax	(138,887)	(141,744)
Other comprehensive income (loss) before reclassifications	(2,221)	(1,276)
Amounts reclassified from accumulated other comprehensive income (loss)	4,512	4,133
Net current-year other comprehensive income (loss)	2,291	2,857
Acquisition of noncontrolling interest	0
Ending balance, accumulated other comprehensive income (loss), net of tax	(136,596)	(138,887)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, accumulated other comprehensive income (loss), net of tax	(229,746)	(119,151)
Other comprehensive income (loss) before reclassifications	(69,119)	(110,595)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net current-year other comprehensive income (loss)	(69,119)	(110,595)
Acquisition of noncontrolling interest	(832)
Ending balance, accumulated other comprehensive income (loss), net of tax	$ (299,697)	$ (229,746)

X

- Definition

Reclassification from Accumulated Other Comprehensive Income, Acquisition of Noncontrolling Interest, Net of Tax

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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