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Goodwill - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Jan. 03, 2018	Dec. 20, 2017	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Acquisition of a business			$ 3,406	$ 28,609
Changes to preliminary purchase price allocations			957
Modular – US
Goodwill [Line Items]
Acquisition of a business			3,406	28,609
Changes to preliminary purchase price allocations			957
Modular – US | Acton Mobile Holdings LLC
Goodwill [Line Items]
Acquisition of a business		$ 28,600
Modular – US | Tyson Onsite
Goodwill [Line Items]
Acquisition of a business	$ 3,400
Modular – Other North America
Goodwill [Line Items]
Acquisition of a business			0	$ 0
Changes to preliminary purchase price allocations			$ 0

X

- 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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- 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

No definition available.

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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