XML 25 R14.htm IDEA: XBRL DOCUMENT
v3.22.2

Financial Instruments | 6 Months Ended
--- | ---
Jun. 30, 2022
Financial Instruments Disclosure [Abstract] |
Financial Instruments | 7. Financial Instruments The Company’s financial instruments include temporary cash investments, restricted cash, accounts receivable, notes receivable, accounts payable, publicly-registered long-term notes, debentures and other long-term debt. Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits. The Company’s cash equivalents have original maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value. Restricted cash is held in a trust account with a third-party intermediary. Due to the short-term nature of this account, the fair value of restricted cash approximates its carrying value. Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. No single customer accounted for 10% or more of consolidated accounts receivable in the six-month periods ended June 30, 2022 and 2021. The estimated fair values of accounts receivable approximate their carrying amounts due to the short-term nature of the accounts. Notes receivable are primarily promissory notes with customers and are not publicly traded. Management estimates that the fair value of notes receivable approximates its carrying amount. Accounts payable represent amounts owed to suppliers and vendors. The estimated fair value of accounts payable approximates the carrying amount due to the short-term nature of the payables. The carrying values and fair values of the Company’s long-term debt were $5.04 billion and $4.48 billion, respectively, at June 30, 2022 and $5.10 billion and $5.45 billion, respectively, at December 31, 2021. The estimated fair value of the publicly-registered long-term notes was estimated using quoted market prices. The estimated fair values of other borrowings approximate their carrying amounts as the interest rates reset periodically.

X
- Definition Financial instruments disclosure. + References No definition available. + Details
Name: | mlm_FinancialInstrumentsDisclosureAbstract
Namespace Prefix: | mlm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
Name: | us-gaap_FinancialInstrumentsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration