Summary of Significant Accounting Policies - Impairment and Intangibles (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)
Goodwill and other intangible assets
Number of Reporting Units \| item	3
Goodwill	$ 238,286	$ 160,932
Goodwill impairment	0	0
Impairment of indefinite-lived assets	0	0
Finite-lived intangible asset impairment	0	0
Impairment of long-lived assets	$ 0	$ 0
Distribution network \| Minimum
Goodwill and other intangible assets
Amortization period	15 years
Distribution network \| Maximum
Goodwill and other intangible assets
Amortization period	20 years
Trademark \| Minimum
Goodwill and other intangible assets
Amortization period	7 years
Trademark \| Maximum
Goodwill and other intangible assets
Amortization period	25 years
Patents \| Minimum
Goodwill and other intangible assets
Amortization period	7 years
Patents \| Maximum
Goodwill and other intangible assets
Amortization period	20 years
Customer relations
Goodwill and other intangible assets
Amortization period		15 years
Customer relations \| Minimum
Goodwill and other intangible assets
Amortization period	15 years
Customer relations \| Maximum
Goodwill and other intangible assets
Amortization period	19 years 6 months
Noncompete agreements
Goodwill and other intangible assets
Amortization period		4 years
Noncompete agreements \| Minimum
Goodwill and other intangible assets
Amortization period	4 years
Noncompete agreements \| Maximum
Goodwill and other intangible assets
Amortization period	5 years
Work Truck Attachment
Goodwill and other intangible assets
Goodwill	$ 160,932	$ 160,932
Work Truck Solutions
Goodwill and other intangible assets
Goodwill	$ 77,354

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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