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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Significant Accounting Policies [Line Items] |
Changes in Accumulated Other Comprehensive Earnings Net of Tax | Changes in accumulated other comprehensive earnings, net of tax, are as follows:
|  | (Dollars in Thousands) |
|  | Pension and Postretirement Benefit Plans |  |  | Foreign Currency |  |  | Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  | Accumulated Other Comprehensive Loss |
|  | Three Months Ended March 31, 2019 |
Balance at beginning of period |  | $ | (141,505 | ) |  | $ | (2,074 | ) |  | $ | — |  |  | $ | (143,579 | )
Other comprehensive earnings before reclassifications, net of tax |  |  | — |  |  |  | 497 |  |  |  | — |  |  |  | 497 |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 2,758 |  |  |  | — |  |  |  | — |  |  |  | 2,758 |
Other comprehensive earnings, net of tax |  |  | 2,758 |  |  |  | 497 |  |  |  | — |  |  |  | 3,255 |
Balance at end of period |  | $ | (138,747 | ) |  | $ | (1,577 | ) |  | $ | — |  |  | $ | (140,324 | )
|  | Three Months Ended March 31, 2018 |
Balance at beginning of period |  | $ | (128,802 | ) |  | $ | (22 | ) |  | $ | (280 | ) |  | $ | (129,104 | )
Other comprehensive loss before reclassifications, net of tax |  |  | — |  |  |  | (587 | ) |  |  | — |  |  |  | (587 | )
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 1,996 |  |  |  | — |  |  |  | 210 |  |  |  | 2,206 |
Other comprehensive earnings (loss), net of tax |  |  | 1,996 |  |  |  | (587 | ) |  |  | 210 |  |  |  | 1,619 |
Balance at end of period |  | $ | (126,806 | ) |  | $ | (609 | ) |  | $ | (70 | ) |  | $ | (127,485 | )
Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss | Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:
|  | (Dollars in Thousands) |
|  | Pension and Postretirement Benefit Plans |  |  | Unamortized Value of Terminated Forward Starting Interest Rate Swap |  |  | Net Noncurrent Deferred Tax Assets |
|  | Three Months Ended March 31, 2019 |
Balance at beginning of period |  | $ | 84,207 |  |  | $ | — |  |  | $ | 84,207 |
Tax effect of other comprehensive earnings |  |  | (868 | ) |  |  | — |  |  |  | (868 | )
Balance at end of period |  | $ | 83,339 |  |  | $ | — |  |  | $ | 83,339 |
|  | Three Months Ended March 31, 2018 |
Balance at beginning of period |  | $ | 79,938 |  |  | $ | 178 |  |  | $ | 80,116 |
Tax effect of other comprehensive earnings |  |  | (658 | ) |  |  | (137 | ) |  |  | (795 | )
Balance at end of period |  | $ | 79,280 |  |  | $ | 41 |  |  | $ | 79,321 |
Reclassification Out of Accumulated Other Comprehensive Loss | Reclassifications out of accumulated other comprehensive loss are as follows:
|  | Three Months Ended |  |  | Affected line items in the consolidated
|  | March 31, |  |  | statements of earnings and
|  | 2019 |  |  | 2018 |  |  | comprehensive earnings
|  | (Dollars in Thousands) |  |  |
Pension and postretirement benefit plans |  |  |  |  |  |  |  |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | (188 | ) |  | $ | (585 | ) |  |
Actuarial loss |  |  | 3,814 |  |  |  | 3,239 |  |  |
|  |  | 3,626 |  |  |  | 2,654 |  |  | Other nonoperating income, net
Tax benefit |  |  | (868 | ) |  |  | (658 | ) |  | Income tax (benefit) expense
|  | $ | 2,758 |  |  | $ | 1,996 |  |  |
Unamortized value of terminated forward starting interest rate swap |  |  |  |  |  |  |  |  |  |
Additional interest expense |  | $ | — |  |  | $ | 347 |  |  | Interest expense
Tax benefit |  |  | — |  |  |  | (137 | ) |  | Income tax (benefit) expense
|  | $ | — |  |  | $ | 210 |  |  |
Basic and Diluted Earnings Per Common Share | The following table reconciles the numerator and denominator for basic and diluted earnings per common share:
|  | Three Months Ended |
|  | March 31, |
|  | 2019 |  |  | 2018 |
|  | (In Thousands) |
Net earnings attributable to Martin Marietta Materials, Inc. |  | $ | 42,853 |  |  | $ | 10,023 |
Less: Distributed and undistributed earnings attributable to unvested awards |  |  | 86 |  |  |  | 63 |
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. |  | $ | 42,767 |  |  | $ | 9,960 |
Basic weighted-average common shares outstanding |  |  | 62,584 |  |  |  | 62,957 |
Effect of dilutive employee and director awards |  |  | 193 |  |  |  | 265 |
Diluted weighted-average common shares outstanding |  |  | 62,777 |  |  |  | 63,222 |
Parent |
Significant Accounting Policies [Line Items] |
Comprehensive Earnings | Comprehensive earnings attributable to Martin Marietta is as follows:
|  | Three Months Ended |
|  | March 31, |
|  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Net earnings attributable to Martin Marietta Materials, Inc. |  | $ | 42,853 |  |  | $ | 10,023 |
Other comprehensive earnings, net of tax |  |  | 3,255 |  |  |  | 1,619 |
Comprehensive earnings attributable to Martin Marietta Materials, Inc. |  | $ | 46,108 |  |  | $ | 11,642 |
Noncontrolling Interests |
Significant Accounting Policies [Line Items] |
Comprehensive Earnings | Comprehensive earnings attributable to noncontrolling interests consist of net earnings and adjustments for the funded status of pension and postretirement benefit plans. For the three months ended March 31, 2019 and 2018, there were no other comprehensive earnings attributable to noncontrolling interests.

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