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Acquisitions and divestitures - Reconciliation of Changes in Contingent Earn-Out Obligations (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Contingent Earn-Out Obligations [Roll Forward]
Beginning balance, January 1, 2017	$ 9,977
Contingent earn-out obligations associated with acquisitions	4,110
Remeasurement of fair value for contingent earn-out obligations	(1,072)
Payments on contingent earn-out obligations	(4,060)
Ending balance	$ 8,955

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- Definition

Business combination contingent consideration acquisitions earnouts payments.

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- Definition

Business combination contingent consideration acquisitions, fair value remeasurement (gain) loss.

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- Definition

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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