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Notes Payable - Components of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | $ 322,478 us-gaap_NotesPayable | $ 322,280 us-gaap_NotesPayable | $ 307,000 us-gaap_NotesPayable | $ 288,081 us-gaap_NotesPayable | $ 290,003 us-gaap_NotesPayable | $ 280,902 us-gaap_NotesPayable | $ 278,875 us-gaap_NotesPayable | $ 281,251 us-gaap_NotesPayable
Unsecured Revolving Lines of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 202,478 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  | 190,003 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |
Senior Notes [Member] | 4.03% senior notes due in 2018 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 80,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = mgrc_FourPointZeroThreePercentDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 100,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = mgrc_FourPointZeroThreePercentDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Senior Notes [Member] | 3.68% senior notes due in 2021 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | $ 40,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = mgrc_ThreePointSixEightPercentDueTwoThousandTwentyOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |

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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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