XML 25 R14.htm IDEA: XBRL DOCUMENT
v3.23.2

Financial Instruments | 6 Months Ended
--- | ---
Jun. 30, 2023
Financial Instruments Disclosure [Abstract] |
Financial Instruments | 5. Financial Instruments The Company’s financial instruments include temporary cash investments, restricted cash, restricted investments, accounts receivable, note receivable, accounts payable, publicly-registered long-term notes and debentures. Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposit accounts with financial institutions. The Company’s cash equivalents have 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 carrying value of restricted cash approximates its fair value. Restricted investments are held in a fund that invests solely in U.S. Treasury securities. The estimated fair value of the fund is valued at net asset value, which the fund seeks to maintain at one dollar per share. As such, the carrying value of the restricted investments approximates its fair value. The Company is restricted from accessing the investments, which will be used to settle the 2023 Notes and related interest payments. Investment returns on those trust assets are for the account of the Company if there are any remaining after satisfaction of all amounts payable in connection with the 2023 Notes. 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 at June 30, 2023 and December 31, 2022. The carrying values of accounts receivable approximate their fair values. Note receivable is a promissory note with an unconsolidated affiliate (see Note 8) and is not publicly traded. Management estimates that the carrying value of the note receivable approximates its fair value. Accounts payable represent amounts owed to suppliers and vendors. The estimated carrying value of accounts payable approximates its fair value due to the short-term nature of the payables. The carrying value and fair value of the Company’s long-term debt were $5.04 billion and $4.41 billion, respectively, at June 30, 2023 and $5.04 billion and $4.36 billion, respectively, at December 31, 2022. The estimated fair value of the Company’s publicly-registered long-term debt was estimated based on Level 1 of the fair value hierarchy using quoted market prices.

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