Supplemental Cash Flow Information - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Increase in income tax benefit	$ 23,300,000us-gaap_IncreaseDecreaseInIncomeTaxes
Decrease in accrued interest expenses	4,403,000
Decrease in book overdraft	$ 5,724,000mlm_IncreaseDecreaseInBookOverdraft

The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInInterestPayableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration