Nature of operations, basis of presentation and recently issues accounting pronouncements - Additional Information (Detail) $ in Thousands		9 Months Ended
Jan. 01, 2016 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Number of strategic business units \| Segment		4
Decrease in net cash provided by financing activities		$ 37,662	$ (34,370)
Increase in net cash from operating activities		$ 38,396	26,539
ASU 2016-09 [Member]
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Decrease in net cash provided by financing activities			300
Increase in net cash from operating activities			$ 300
Cumulative-effect adjustment to retained earnings	$ 1,400

Organization consolidation basis of presentation business description and accounting policies.

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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