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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 111,792us-gaap_Revenues	$ 113,025us-gaap_Revenues	$ 95,745us-gaap_Revenues	$ 87,560us-gaap_Revenues	$ 94,772us-gaap_Revenues	$ 108,839us-gaap_Revenues	$ 87,156us-gaap_Revenues	$ 88,742us-gaap_Revenues	$ 408,122us-gaap_Revenues	$ 379,509us-gaap_Revenues	$ 364,039us-gaap_Revenues
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues									161,575us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember	132,661us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember	119,767us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues									17,457us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember	17,855us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember	23,823us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues									19,017us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember	17,859us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember	24,240us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_EnviroplexMember
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues									$ 1,560us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember	$ 4us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember	$ 417us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mgrc_MobileModularMember

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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

X

- Details

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Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mgrc_EnviroplexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mgrc_MobileModularMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: