Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Expense on defined contribution plan		$ 1.8	$ 1.9	$ 1.4
Favorable adjustment to income tax provision	$ 0.3
Capitalized Software
Business Acquisition [Line Items]
Intangible assets useful life		3 years
Customer relationships
Business Acquisition [Line Items]
Intangible assets amortization period		15 years
Trademarks
Business Acquisition [Line Items]
Intangible assets amortization period		15 years
Buildings | Minimum [Member]
Business Acquisition [Line Items]
Property, plant and equipment useful life		20 years
Buildings | Maximum
Business Acquisition [Line Items]
Property, plant and equipment useful life		25 years
Plant Machinery [Member] | Minimum [Member]
Business Acquisition [Line Items]
Property, plant and equipment useful life		5 years
Plant Machinery [Member] | Maximum
Business Acquisition [Line Items]
Property, plant and equipment useful life		25 years
Mobile Equipment [Member] | Minimum [Member]
Business Acquisition [Line Items]
Property, plant and equipment useful life		5 years
Mobile Equipment [Member] | Maximum
Business Acquisition [Line Items]
Property, plant and equipment useful life		8 years