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Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Significant Accounting Policies [Line Items] |
Changes in Accumulated Other Comprehensive Loss Net of Tax | Changes in accumulated other comprehensive loss, 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 June 30, 2019 |
Balance at beginning of period |  | $ | (138,747 | ) |  | $ | (1,577 | ) |  | $ | — |  |  | $ | (140,324 | )
Other comprehensive earnings before reclassifications, net of tax |  |  | — |  |  |  | 264 |  |  |  | — |  |  |  | 264 |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 2,726 |  |  |  | — |  |  |  | — |  |  |  | 2,726 |
Other comprehensive earnings, net of tax |  |  | 2,726 |  |  |  | 264 |  |  |  | — |  |  |  | 2,990 |
Balance at end of period |  | $ | (136,021 | ) |  | $ | (1,313 | ) |  | $ | — |  |  | $ | (137,334 | )
|  | Three Months Ended June 30, 2018 |
Balance at beginning of period |  | $ | (126,806 | ) |  | $ | (609 | ) |  | $ | (70 | ) |  | $ | (127,485 | )
Other comprehensive loss before reclassifications, net of tax |  |  | — |  |  |  | (476 | ) |  |  | — |  |  |  | (476 | )
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 2,008 |  |  |  | — |  |  |  | 70 |  |  |  | 2,078 |
Other comprehensive earnings (loss), net of tax |  |  | 2,008 |  |  |  | (476 | ) |  |  | 70 |  |  |  | 1,602 |
Balance at end of period |  | $ | (124,798 | ) |  | $ | (1,085 | ) |  | $ | — |  |  | $ | (125,883 | )
|  | Six Months Ended June 30, 2019 |
Balance at beginning of period |  | $ | (141,505 | ) |  | $ | (2,074 | ) |  | $ | — |  |  | $ | (143,579 | )
Other comprehensive earnings before reclassifications, net of tax |  |  | — |  |  |  | 761 |  |  |  | — |  |  |  | 761 |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 5,484 |  |  |  | — |  |  |  | — |  |  |  | 5,484 |
Other comprehensive earnings, net of tax |  |  | 5,484 |  |  |  | 761 |  |  |  | — |  |  |  | 6,245 |
Balance at end of period |  | $ | (136,021 | ) |  | $ | (1,313 | ) |  | $ | — |  |  | $ | (137,334 | )
|  | Six Months Ended June 30, 2018 |
Balance at beginning of period |  | $ | (128,802 | ) |  | $ | (22 | ) |  | $ | (280 | ) |  | $ | (129,104 | )
Other comprehensive loss before reclassifications, net of tax |  |  | — |  |  |  | (1,063 | ) |  |  | — |  |  |  | (1,063 | )
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 4,004 |  |  |  | — |  |  |  | 280 |  |  |  | 4,284 |
Other comprehensive earnings (loss), net of tax |  |  | 4,004 |  |  |  | (1,063 | ) |  |  | 280 |  |  |  | 3,221 |
Balance at end of period |  | $ | (124,798 | ) |  | $ | (1,085 | ) |  | $ | — |  |  | $ | (125,883 | )
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 June 30, 2019 |
Balance at beginning of period |  | $ | 83,339 |  |  | $ | — |  |  | $ | 83,339 |
Tax effect of other comprehensive earnings |  |  | (922 | ) |  |  | — |  |  |  | (922 | )
Balance at end of period |  | $ | 82,417 |  |  | $ | — |  |  | $ | 82,417 |
|  | Three Months Ended June 30, 2018 |
Balance at beginning of period |  | $ | 79,280 |  |  | $ | 41 |  |  | $ | 79,321 |
Tax effect of other comprehensive earnings |  |  | (661 | ) |  |  | (41 | ) |  |  | (702 | )
Balance at end of period |  | $ | 78,619 |  |  | $ | — |  |  | $ | 78,619 |
|  | Six Months Ended June 30, 2019 |
Balance at beginning of period |  | $ | 84,207 |  |  | $ | — |  |  | $ | 84,207 |
Tax effect of other comprehensive earnings |  |  | (1,790 | ) |  |  | — |  |  |  | (1,790 | )
Balance at end of period |  | $ | 82,417 |  |  | $ | — |  |  | $ | 82,417 |
|  | Six Months Ended June 30, 2018 |
Balance at beginning of period |  | $ | 79,938 |  |  | $ | 178 |  |  | $ | 80,116 |
Tax effect of other comprehensive earnings |  |  | (1,319 | ) |  |  | (178 | ) |  |  | (1,497 | )
Balance at end of period |  | $ | 78,619 |  |  | $ | — |  |  | $ | 78,619 |
Reclassification Out of Accumulated Other Comprehensive Loss | Reclassifications out of accumulated other comprehensive loss are as follows:
|  | Three Months Ended |  |  | Six Months Ended |  |  | Affected line items in the consolidated
|  | June 30, |  |  | June 30, |  |  | statements of earnings and
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | comprehensive earnings
|  | (Dollars in Thousands) |  |  |
Pension and postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | (184 | ) |  | $ | (400 | ) |  | $ | (396 | ) |  | $ | (985 | ) |  |
Actuarial loss |  |  | 3,832 |  |  |  | 3,069 |  |  |  | 7,670 |  |  |  | 6,308 |  |  |
|  |  | 3,648 |  |  |  | 2,669 |  |  |  | 7,274 |  |  |  | 5,323 |  |  | Other nonoperating expense and (income), net
Tax benefit |  |  | (922 | ) |  |  | (661 | ) |  |  | (1,790 | ) |  |  | (1,319 | ) |  | Income tax expense
|  | $ | 2,726 |  |  | $ | 2,008 |  |  | $ | 5,484 |  |  | $ | 4,004 |  |  |
Unamortized value of terminated forward starting interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest expense |  | $ | — |  |  | $ | 111 |  |  | $ | — |  |  | $ | 458 |  |  | Interest expense
Tax benefit |  |  | — |  |  |  | (41 | ) |  |  | — |  |  |  | (178 | ) |  | Income tax expense
|  | $ | — |  |  | $ | 70 |  |  | $ | — |  |  | $ | 280 |  |  |
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 |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (In Thousands) |
Net earnings attributable to Martin Marietta Materials, Inc. |  | $ | 189,475 |  |  | $ | 185,377 |  |  | $ | 232,328 |  |  | $ | 195,400 |
Less: Distributed and undistributed earnings attributable to unvested awards |  |  | 400 |  |  |  | 317 |  |  |  | 491 |  |  |  | 378 |
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. |  | $ | 189,075 |  |  | $ | 185,060 |  |  | $ | 231,837 |  |  | $ | 195,022 |
Basic weighted-average common shares outstanding |  |  | 62,563 |  |  |  | 63,021 |  |  |  | 62,574 |  |  |  | 62,989 |
Effect of dilutive employee and director awards |  |  | 157 |  |  |  | 264 |  |  |  | 175 |  |  |  | 264 |
Diluted weighted-average common shares outstanding |  |  | 62,720 |  |  |  | 63,285 |  |  |  | 62,749 |  |  |  | 63,253 |
Parent |
Significant Accounting Policies [Line Items] |
Comprehensive Earnings | Comprehensive earnings attributable to Martin Marietta is as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Net earnings attributable to Martin Marietta Materials, Inc. |  | $ | 189,475 |  |  | $ | 185,377 |  |  | $ | 232,328 |  |  | $ | 195,400 |
Other comprehensive earnings, net of tax |  |  | 2,990 |  |  |  | 1,602 |  |  |  | 6,245 |  |  |  | 3,221 |
Comprehensive earnings attributable to Martin Marietta Materials, Inc. |  | $ | 192,465 |  |  | $ | 186,979 |  |  | $ | 238,573 |  |  | $ | 198,621 |
Noncontrolling Interests |
Significant Accounting Policies [Line Items] |
Comprehensive Earnings | Comprehensive earnings attributable to noncontrolling interests, consisting of net earnings and adjustments for the funded status of pension and postretirement benefit plans, are as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Net (loss) earnings attributable to noncontrolling interests |  | $ | (6 | ) |  | $ | 126 |  |  | $ | (32 | ) |  | $ | 143 |
Other comprehensive earnings, net of tax |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Comprehensive (loss) earnings attributable to noncontrolling interests |  | $ | (5 | ) |  | $ | 126 |  |  | $ | (32 | ) |  | $ | 144 |

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