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v3.25.3

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Period for credit risk identified |  |  | 30 days |  |
Revenue from contracts criteria over time |  |  | multiple quarters |  |
Sales revenues totaling | $ 5,800 |  | $ 34,500 |  |
Revenues | 256,443 | $ 266,758 | 687,475 | $ 667,196 |
Total Future minimum flease payments expected to be received | 6,200 |  | 6,200 |  |
Future minimum flease payments expected to be received remainder of the current year | 1,100 |  | 1,100 |  |
Future minimum flease payments expected to be received in 2026 | 2,200 |  | 2,200 |  |
Future minimum flease payments expected to be received in 2027 | 1,000 |  | 1,000 |  |
Future minimum flease payments expected to be received in 2028 | 1,100 |  | 1,100 |  |
Future minimum flease payments expected to be received in 2029 | 800 |  | 800 |  |
Lease revenue | 158,900 |  | 461,000 |  |
Operating lease revenue | 158,100 |  | 457,900 |  |
Finance lease revenue | 800 |  | 3,100 |  |
Finance lease revenue, sales revenue | 600 |  | 2,400 |  |
Finance lease revenue, interest income | 200 |  | $ 700 |  |
Period for warranties for rental equipment |  |  | 90 days |  |
Period for warranties for equipment manufactured |  |  | 1 year |  |
Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenues | 79,500 |  | $ 184,300 |  |
Transferred Over Time [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenues | 18,100 |  | 42,200 |  |
Deferred Income [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Customer contract liability | 48,900 |  | 48,900 |  | $ 35,400
Accounts Receivable [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Unbilled contract assets | $ 9,900 |  | $ 9,900 |  | $ 13,000

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Period Type: | instant

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=mgrc_DeferredIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |