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Other Expenses - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income And Expenses [Abstract]
Business development costs	$ 42,891	$ 671	$ 35,140
Business development expense, net of tax			21,242mlm_BusinessDevelopmentExpenseNetOfTax
Business development expense, per diluted share			$ 0.46
Retirement and severance expenses			$ 3,885us-gaap_SeveranceCosts1
Increase decrease in net earnings per diluted share due to retirement expenses			$ (0.05)

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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