Segment and Geographic Information - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)
Segment Reporting Information
Number of reportable segments \| segment	2
RANA
Segment Reporting Information
Capital expenditures	$ 12.2	$ 17.8
RAEU
Segment Reporting Information
Capital expenditures	$ 11.6	$ 13.0

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration