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Acquisitions (2016 and 2015 Acquisitions) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill acquired		$ 44,610	$ 51,935
Other intangible assets, acquired	$ 24,987	11,467	24,987
Acquisitions 2016 [Member]
Business Acquisition [Line Items]
Net tangible assets acquired		40,000
Goodwill acquired		44,600
Other intangible assets, acquired		$ 11,500
Acquisitions 2015 [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	2,100
Goodwill acquired	4,400
Other intangible assets, acquired	$ 3,300		$ 3,300

X

- Definition

Amount of tangible assets acquired less liabilities assumed at the acquisition date.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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