Martin Marietta Materials (MLM) 10-K 24 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 10, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Trading Symbol	MLM
Entity Registrant Name	MARTIN MARIETTA MATERIALS INC
Entity Central Index Key	916,076
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		63,067,156
Entity Public Float			$ 8,873,085,696

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net Sales	$ 3,576,767	$ 3,268,116	$ 2,679,095
Freight and delivery revenues	241,982	271,454	278,856
Total revenues	3,818,749	3,539,570	2,957,951
Cost of sales	2,667,801	2,546,349	2,156,735
Freight and delivery costs	241,982	271,454	278,856
Total cost of revenues	2,909,783	2,817,803	2,435,591
Gross Profit	908,966	721,767	522,360
Selling, general and administrative expenses	248,005	218,234	169,245
Acquisition-related expenses, net	1,683	8,464	42,891
Other operating (income) and expenses, net	(8,043)	15,653	(4,649)
Earnings from Operations	667,321	479,416	314,873
Interest expense	81,677	76,287	66,057
Other nonoperating income, net	(21,384)	(10,672)	(362)
Earnings from continuing operations before taxes on income	607,028	413,801	249,178
Taxes on income	181,584	124,863	94,847
Earnings from Continuing Operations	425,444	288,938	154,331
Loss on discontinued operations, net of related tax benefit of $0, $0 and $40, respectively			(37)
Consolidated net earnings	425,444	288,938	154,294
Less: Net earnings (loss) attributable to noncontrolling interests	58	146	(1,307)
Net Earnings Attributable to Martin Marietta	425,386	288,792	155,601
Net Earnings (Loss) Attributable to Martin Marietta
Earnings from continuing operations	425,386	288,792	155,638
Discontinued operations			(37)
Net Earnings Attributable to Martin Marietta	$ 425,386	$ 288,792	$ 155,601
Net Earnings Attributable to Martin Marietta Per Common Share (see Note A)
Basic from continuing operations attributable to common shareholders	$ 6.66	$ 4.31	$ 2.73
Earnings Per Share, Basic, Total	6.66	4.31	2.73
Diluted from continuing operations attributable to common shareholders	6.63	4.29	2.71
Earnings Per Share, Diluted, Total	$ 6.63	$ 4.29	$ 2.71
Weighted-Average Common Shares Outstanding
Basic	63,610	66,770	56,854
Diluted	63,861	67,020	57,088

Consolidated Statements of Ear3

Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Loss on discontinued operations, related tax benefit	$ 0	$ 0	$ 40

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Consolidated Net Earnings	$ 425,444	$ 288,938	$ 154,294
Defined benefit pension and postretirement plans:
Net loss arising during period, net of tax of $(19,734), $(4,530) and $(39,752), respectively	(31,620)	(7,101)	(62,767)
Amortization of prior service credit, net of tax of $(617), $(731) and $(1,108), respectively	(992)	(1,149)	(1,702)
Amortization of actuarial loss, net of tax of $4,437, $6,551 and $1,490, respectively	7,138	10,299	2,289
Amount recognized in net periodic pension cost due to settlement, net of tax of $44	71
Amount recognized in net periodic pension cost due to special plan termination benefits, net of tax of $293 and $811, respectively	471	1,274
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(24,932)	3,323	(62,180)
Foreign currency translation loss	(898)	(3,542)	(624)
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, net of tax of $541, $509 and $470, respectively	826	771	718
Other Comprehensive Income (Loss), Net of Tax	(25,004)	552	(62,086)
Consolidated comprehensive earnings	400,440	289,490	92,208
Less: Comprehensive earnings (loss) attributable to noncontrolling interests	119	161	(1,348)
Comprehensive Earnings Attributable to Martin Marietta	$ 400,321	$ 289,329	$ 93,556

Consolidated Statements of Com5

Consolidated Statements of Comprehensive Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss arising during period, tax	$ (19,734)	$ (4,530)	$ (39,752)
Amortization of prior service credit, tax	(617)	(731)	(1,108)
Amortization of actuarial loss, tax	4,437	6,551	1,490
Amount recognized in net periodic pension cost due to settlement, tax	44
Amount recognized in net periodic pension cost due to special plan termination benefits, tax	293	811
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, tax	$ 541	$ 509	$ 470

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 50,038	$ 168,409
Accounts receivable, net	457,910	410,921
Inventories, net	521,624	469,141
Other current assets	56,813	33,164
Total Current Assets	1,086,385	1,081,635
Property, plant and equipment, net	3,423,395	3,156,000
Goodwill	2,159,337	2,068,235
Operating permits, net	442,202	444,725
Other intangibles, net	69,110	65,827
Other noncurrent assets	120,476	141,189
Total Assets	7,300,905	6,957,611
Current Liabilities:
Bank overdraft		10,235
Accounts payable	178,598	164,718
Accrued salaries, benefits and payroll taxes	47,428	30,939
Pension and postretirement benefits	9,293	8,168
Accrued insurance and other taxes	60,093	62,781
Current maturities of long-term debt	180,036	18,713
Other current liabilities	71,140	71,104
Total Current Liabilities	546,588	366,658
Long-term debt	1,506,153	1,550,061
Pension, postretirement and postemployment benefits	248,086	224,538
Deferred income taxes, net	663,019	583,459
Other noncurrent liabilities	194,469	172,718
Total Liabilities	3,158,315	2,897,434
Equity:
Common stock ($0.01 par value; 100,000,000 shares authorized; 63,176,000 and 64,479,000 shares outstanding at December 31, 2016 and 2015, respectively)	630	643
Preferred stock ($0.01 par value; 10,000,000 shares authorized; no shares outstanding)
Additional paid-in capital	3,334,461	3,287,827
Accumulated other comprehensive loss	(130,687)	(105,622)
Retained earnings	935,574	874,436
Total Shareholders’ Equity	4,139,978	4,057,284
Noncontrolling interests	2,612	2,893
Total Equity	4,142,590	4,060,177
Total Liabilities and Equity	$ 7,300,905	$ 6,957,611

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	63,176,000	64,479,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Consolidated net earnings	$ 425,444	$ 288,938	$ 154,294
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	285,253	263,587	222,746
Stock-based compensation expense	20,481	13,589	8,993
Loss (gain) on divestitures and sales of assets	410	14,093	(52,297)
Deferred income taxes	67,050	85,225	50,292
Excess tax benefits from stock-based compensation transactions	(6,792)		(2,508)
Other items, net	(17,730)	(5,972)	4,795
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(25,072)	12,309	(16,650)
Inventories, net	(47,381)	(21,525)	(12,020)
Accounts payable	(8,116)	(40,053)	5,303
Other assets and liabilities, net	(14,893)	(37,040)	18,710
Net Cash Provided by Operating Activities	678,654	573,151	381,658
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(387,267)	(318,232)	(232,183)
Acquisitions, net	(178,768)	(43,215)	(189)
Cash received in acquisition	4,246	63	59,887
Proceeds from divestitures and sales of assets	6,476	448,122	121,985
Payment of railcar construction advances	(82,910)	(25,234)	(14,513)
Reimbursement of railcar construction advances	82,910	25,234	14,513
Repayments from affiliate		1,808	1,175
Net Cash (Used for) Provided by Investing Activities	(555,313)	88,546	(49,325)
Cash Flows from Financing Activities:
Borrowings of long-term debt	560,000	230,000	868,762
Repayments of long-term debt	(449,306)	(244,704)	(1,057,289)
Debt issuance costs	(2,300)		(2,782)
Change in bank overdraft	(10,235)	10,052	(2,373)
Payments on capital lease obligations	(3,364)	(6,616)	(3,075)
Dividends paid	(105,036)	(107,462)	(91,304)
Distributions to owners of noncontrolling interests	(400)	(325)	(800)
Contributions by noncontrolling interest to joint venture	44
Repurchase of common stock	(259,228)	(519,962)
Purchase of remaining interest in existing subsidiaries			(19,480)
Issuances of common stock	21,321	37,078	39,714
Excess tax benefits from stock-based compensation transactions	6,792		2,508
Net Cash Used for Financing Activities	(241,712)	(601,939)	(266,119)
Net (Decrease) Increase in Cash and Cash Equivalents	(118,371)	59,758	66,214
Cash and Cash Equivalents, beginning of year	168,409	108,651	42,437
Cash and Cash Equivalents, end of year	$ 50,038	$ 168,409	$ 108,651

Consolidated Statements of Tota

Consolidated Statements of Total Equity - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Earnings	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2013	$ 1,574,919,000	$ 461,000	$ 432,792,000	$ (44,114,000)	$ 1,148,738,000	$ 1,537,877,000	$ 37,042,000
Beginning Balance (in shares) at Dec. 31, 2013		46,261,000
Consolidated net earnings (loss)	154,294,000				155,601,000	155,601,000	(1,307,000)
Other comprehensive earnings (loss)	(62,086,000)			(62,045,000)		(62,045,000)	(41,000)
Dividends declared ($1.60 in 2014 & 2015 and $1.64 in 2016 per common share)	(91,304,000)				(91,304,000)	(91,304,000)
Issuances of common stock, stock options and stock appreciation rights for TXI acquisition	2,751,873,000	$ 203,000	2,751,670,000			2,751,873,000
Issuances of common stock, stock options and stock appreciation rights for TXI acquisition (in shares)		20,309,000
Issuances of common stock for stock award plans	$ 41,772,000	$ 7,000	41,765,000			41,772,000
Issuances of common stock for stock award plans (in shares)		723,000
Repurchases of common stock, Shares	0
Stock-based compensation expense	$ 8,993,000		8,993,000			8,993,000
Distributions to owners of noncontrolling interests	(800,000)						(800,000)
Purchase of subsidiary shares from noncontrolling interest	(24,913,000)		8,399,000			8,399,000	(33,312,000)
Ending Balance at Dec. 31, 2014	4,352,748,000	$ 671,000	3,243,619,000	(106,159,000)	1,213,035,000	4,351,166,000	1,582,000
Ending Balance (in shares) at Dec. 31, 2014		67,293,000
Consolidated net earnings (loss)	288,938,000				288,792,000	288,792,000	146,000
Other comprehensive earnings (loss)	552,000			537,000		537,000	15,000
Dividends declared ($1.60 in 2014 & 2015 and $1.64 in 2016 per common share)	(107,462,000)				(107,462,000)	(107,462,000)
Issuances of common stock for stock award plans	30,624,000	$ 5,000	30,619,000			30,624,000
Issuances of common stock for stock award plans (in shares)		471,000
Repurchases of common stock	$ (519,962,000)	$ (33,000)			(519,929,000)	(519,962,000)
Repurchases of common stock, Shares	(3,285,380)	(3,285,000)
Stock-based compensation expense	$ 13,589,000		13,589,000			13,589,000
Noncontrolling interest acquired from business combination	1,475,000						1,475,000
Distributions to owners of noncontrolling interests	(325,000)						(325,000)
Ending Balance at Dec. 31, 2015	$ 4,060,177,000	$ 643,000	3,287,827,000	(105,622,000)	874,436,000	4,057,284,000	2,893,000
Ending Balance (in shares) at Dec. 31, 2015	64,479,000	64,479,000
Consolidated net earnings (loss)	$ 425,444,000				425,386,000	425,386,000	58,000
Other comprehensive earnings (loss)	(25,004,000)			(25,065,000)		(25,065,000)	61,000
Dividends declared ($1.60 in 2014 & 2015 and $1.64 in 2016 per common share)	(105,036,000)				(105,036,000)	(105,036,000)
Issuances of common stock for stock award plans	26,112,000	$ 3,000	26,109,000			26,112,000
Issuances of common stock for stock award plans (in shares)		285,000
Repurchases of common stock	$ (259,228,000)	$ (16,000)			(259,212,000)	(259,228,000)
Repurchases of common stock, Shares	(1,587,987)	(1,588,000)
Stock-based compensation expense	$ 20,481,000		20,481,000			20,481,000
Distributions to owners of noncontrolling interests	(400,000)						(400,000)
Contribution from owners of noncontrolling interest	44,000		44,000			44,000
Ending Balance at Dec. 31, 2016	$ 4,142,590,000	$ 630,000	$ 3,334,461,000	$ (130,687,000)	$ 935,574,000	$ 4,139,978,000	$ 2,612,000
Ending Balance (in shares) at Dec. 31, 2016	63,176,000	63,176,000

Consolidated Statements of To10

Consolidated Statements of Total Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 1.64	$ 1.60	$ 1.60

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Accounting Policies	Notes to Financial Statements Note A: Accounting Policies Organization. Martin Marietta Materials, Inc., (the “Corporation” or “Martin Marietta”) is engaged principally in the construction aggregates business. The aggregates product line includes crushed stone, sand and gravel, and is used for the construction of infrastructure, nonresidential and residential projects. Aggregates products are also used for railroad ballast, and in agricultural, utility and environmental applications. These aggregates products, along with the Corporation’s aggregates-related downstream product lines, namely heavy building materials such as asphalt products, ready mixed concrete and road paving construction services, are sold and shipped from a network of more than 400 quarries, distribution facilities and plants to customers in 29 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and aggregates-related downstream product lines are reported collectively as the “Aggregates business”. As of December 31, 2016, the Aggregates business contains the following reportable segments: Mid-America Group, Southeast Group and West Group. The Mid-America Group operates in Indiana, Iowa, northern Kansas, Kentucky, Maryland, Minnesota, Missouri, eastern Nebraska, North Carolina, Ohio, South Carolina, Virginia, Washington and West Virginia. The Southeast Group has operations in Alabama, Florida, Georgia, Tennessee, Nova Scotia and the Bahamas. The West Group operates in Arkansas, Colorado, southern Kansas, Louisiana, western Nebraska, Nevada, Oklahoma, Texas, Utah and Wyoming. The following states accounted for 73% of the Aggregates business’ 2016 net sales: Texas, Colorado, North Carolina, Iowa and Georgia. The Cement segment produces Portland and specialty cements at two plants in Texas. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. The Magnesia Specialties segment, with production facilities in Ohio and Michigan, produces magnesia-based chemicals products used in industrial, agricultural and environmental applications, and dolomitic lime sold primarily to customers in the steel industry. Use of Estimates. The preparation of the Corporation’s consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets and other long-lived assets and assumptions used in the calculation of taxes on income, retirement and other postemployment benefits, and the allocation of the purchase price to the fair values of assets acquired and liabilities assumed as part of business combinations. These estimates and assumptions are based on management’s judgment. Management evaluates estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, and adjusts such estimates and assumptions when facts and circumstances dictate. Changes in credit, equity and energy markets and changes in construction activity increase the uncertainty inherent in certain estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the consolidated financial statements for the period in which the change in estimate occurs. Basis of Consolidation . The consolidated financial statements include the accounts of the Corporation and its wholly-owned and majority-owned subsidiaries. Partially-owned affiliates are either consolidated or accounted for at cost or as equity investments, depending on the level of ownership interest or the Corporation’s ability to exercise control over the affiliates’ operations. Intercompany balances and transactions have been eliminated in consolidation. Revenue Recognition . Total revenues include sales of materials and services provided to customers, net of discounts or allowances, if any, and include freight and delivery costs billed to customers. Revenues for product sales are recognized when risks associated with ownership have passed to unaffiliated customers. Typically, this occurs when finished products are shipped. Revenues derived from the road paving business are recognized using the percentage-of-completion method under the revenue-cost approach. Under the revenue-cost approach, recognized contract revenue equals the total estimated contract revenue multiplied by the percentage of completion. Recognized costs equal the total estimated contract cost multiplied by the percentage of completion. The percentage of completion is determined by costs incurred to date as a percentage of total costs estimated for the project. Freight and Delivery Costs . Freight and delivery costs represent pass-through transportation costs incurred and paid by the Corporation to third-party carriers to deliver products to customers. These costs are then billed to the customers. Cash and Cash Equivalents . Cash equivalents are comprised of highly-liquid instruments with original maturities of three months or less from the date of purchase. The Corporation manages its cash and cash equivalents to ensure short-term operating cash needs are met and excess funds are managed efficiently. The Corporation subsidizes shortages in operating cash through credit facilities. The Corporation utilizes excess cash to either pay down credit facility borrowings or invest in money market funds, money market demand deposit accounts or Eurodollar time deposit accounts. Money market demand deposits and Eurodollar time deposit accounts are exposed to bank solvency risk. Money market demand deposit accounts are FDIC insured up to $250,000. The Corporation’s deposits in bank funds generally exceed the $250,000 FDIC insurance limit. The Corporation’s cash management policy prohibits cash and cash equivalents over $100,000,000 to be maintained at any one bank. Customer Receivables. Customer receivables are stated at cost. The Corporation does not typically charge interest on customer accounts receivables. The Corporation records an allowance for doubtful accounts, which includes a provision for probable losses based on historical write offs and a specific reserve for accounts greater than $50,000 deemed at risk. The Corporation writes off customer receivables as bad debt expense when it becomes apparent based upon customer facts and circumstances that such amounts will not be collected. Inventories Valuation . Inventories are stated at the lower of cost or net realizable value. Costs for finished products and in process inventories are determined by the first-in, first-out method. The Corporation records an allowance for finished product inventories in excess of sales for a twelve-month period, as measured by historical sales. The Corporation also establishes an allowance for expendable parts over five years old and supplies over one year old. Post-production stripping costs, which represent costs of removing overburden and waste materials to access mineral deposits, are a component of inventory production costs and recognized in cost of sales in the same period as the revenue from the sale of the inventory. Properties and Depreciation . Property, plant and equipment are stated at cost. The estimated service lives for property, plant and equipment are as follows: Class of Assets Range of Service Lives Buildings 5 to 20 years Machinery & Equipment 2 to 20 years Land Improvements 5 to 15 years The Corporation begins capitalizing quarry development costs at a point when reserves are determined to be proven or probable, economically mineable and when demand supports investment in the market. Capitalization of these costs ceases when production commences. Capitalized quarry development costs are classified as land improvements. The Corporation reviews relevant facts and circumstances to determine whether to capitalize or expense pre-production stripping costs when additional pits are developed at an existing quarry. If the additional pit operates in a separate and distinct area of the quarry, these costs are capitalized as quarry development costs and depreciated over the life of the uncovered reserves. Additionally, a separate asset retirement obligation is created for additional pits when the liability is incurred. Once a pit enters the production phase, all post-production stripping costs are charged to inventory production costs as incurred. Mineral reserves and mineral interests acquired in connection with a business combination are valued using an income approach over the life of the reserves. Depreciation is computed over estimated service lives, principally by the straight-line method. Depletion of mineral reserves is calculated over proven and probable reserves by the units-of-production method on a quarry-by-quarry basis. Property, plant and equipment are reviewed for impairment whenever facts and circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized if expected future undiscounted cash flows over the estimated remaining service life of the related asset are less than the asset’s carrying value. Repair and Maintenance Costs. Repair and maintenance costs that do not substantially extend the life of the Corporation’s plant and equipment are expensed as incurred. Goodwill and Intangible Assets. Goodwill represents the excess purchase price paid for acquired businesses over the estimated fair value of identifiable assets and liabilities. Other intangibles represent amounts assigned principally to contractual agreements and are amortized ratably over periods based on related contractual terms. The Corporation’s reporting units, which represent the level at which goodwill is tested for impairment, are based on the geographic regions of the Aggregates business. Additionally, the Cement business is a separate reporting unit. Goodwill is allocated to each reporting unit based on the location of acquisitions and divestitures at the time of consummation. The carrying values of goodwill and other indefinite-lived intangible assets are reviewed annually, as of October 1, for impairment. An interim review is performed between annual tests if facts or circumstances indicate potential impairment. The carrying value of other amortizable intangibles is reviewed if facts and circumstances indicate potential impairment. If a review indicates the carrying value is impaired, a charge is recorded. Retirement Plans and Postretirement Benefits. The Corporation sponsors defined benefit retirement plans and also provides other postretirement benefits. The Corporation recognizes the funded status, defined as the difference between the fair value of plan assets and the benefit obligation, of its pension plans and other postretirement benefits as an asset or liability on the consolidated balance sheets. Actuarial gains or losses that arise during the year are not recognized as net periodic benefit cost in the same year, but rather are recognized as a component of accumulated other comprehensive earnings or loss. Those amounts are amortized over the participants’ average remaining service period and recognized as a component of net periodic benefit cost. The amount amortized is determined using a corridor approach and represents the excess over 10% of the greater of the projected benefit obligation or pension plan assets. Stock-Based Compensation. The Corporation has stock-based compensation plans for employees and its Board of Directors. The Corporation recognizes all forms of stock-based payments to employees, including stock options, as compensation expense. The compensation expense is the fair value of the awards at the measurement date and is recognized over the requisite service period. The fair value of restricted stock awards, incentive compensation awards and Board of Directors’ fees paid in the form of common stock are based on the closing price of the Corporation’s common stock on the awards’ respective grant dates. The fair value of performance stock awards based on total shareholder return is determined by a Monte Carlo simulation methodology. In 2016, the Corporation did not issue any stock options. For stock options issued prior to 2016, the Corporation uses the accelerated expense recognition method. The accelerated recognition method requires stock options that vest ratably to be divided into tranches. The expense for each tranche is allocated to its particular vesting period. The Corporation uses the lattice valuation model to determine the fair value of stock option awards. The lattice valuation model takes into account employees’ exercise patterns based on changes in the Corporation’s stock price and other variables. The period of time for which options are expected to be outstanding, or expected term of the option, is a derived output of the lattice valuation model. The Corporation considers the following factors when estimating the expected term of options: vesting period of the award, expected volatility of the underlying stock, employees’ ages and external data. Key assumptions used in determining the fair value of the stock options awarded in 2015 and 2014 were: 2015 2014 Risk-free interest rate 2.20% 2.50% Dividend yield 1.20% 1.50% Volatility factor 36.10% 35.30% Expected term 8.5 years 8.5 years Based on these assumptions, the weighted-average fair value of each stock option granted was $57.71 and $43.42 for 2015 and 2014, respectively. The risk-free interest rate reflects the interest rate on zero-coupon U.S. government bonds, available at the time each option was granted, having a remaining life approximately equal to the option’s expected life. The dividend yield represents the dividend rate expected to be paid over the option’s expected life. The Corporation’s volatility factor measures the amount by which its stock price is expected to fluctuate during the expected life of the option and is based on historical stock price changes. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Corporation estimates forfeitures and will ultimately recognize compensation cost only for those stock-based awards that vest. For restricted stock awards and incentive stock awards granted prior to 2016, the Corporation recognizes income tax benefits resulting from the payment of dividend equivalents on unvested stock-based payments as an increase to additional paid-in capital and includes them in the pool of excess tax benefits. For awards granted in 2016, dividend equivalents are not paid unless the award vests. Environmental Matters. The Corporation records a liability for an asset retirement obligation at fair value in the period in which it is incurred. The asset retirement obligation is recorded at the acquisition date of a long-lived tangible asset if the fair value can be reasonably estimated. A corresponding amount is capitalized as part of the asset’s carrying amount. The fair value is affected by management’s assumptions regarding the scope of the work required, inflation rates and quarry closure dates. Further, the Corporation records an accrual for other environmental remediation liabilities in the period in which it is probable that a liability has been incurred and the appropriate amounts can be estimated reasonably. Such accruals are adjusted as further information develops or circumstances change. These costs are not discounted to their present value or offset for potential insurance or other claims or potential gains from future alternative uses for a site. Income Taxes . Deferred income taxes, net, on the consolidated balance sheets reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, net of valuation allowances. Uncertain Tax Positions. The Corporation recognizes a tax benefit when it is more-likely-than-not, based on the technical merits, that a tax position would be sustained upon examination by a taxing authority. The amount to be recognized is measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. The Corporation’s unrecognized tax benefits are recorded in other liabilities on the consolidated balance sheets or as an offset to the deferred tax asset for tax carryforwards where available. The Corporation records interest accrued in relation to unrecognized tax benefits as income tax expense. Penalties, if incurred, are recorded as operating expenses in the consolidated statements of earnings. Sales Taxes. Sales taxes collected from customers are recorded as liabilities until remitted to taxing authorities and therefore are not reflected in the consolidated statements of earnings. Research and Development Costs. Research and development costs are charged to operations as incurred. Start-Up Costs. Noncapital start-up costs for new facilities and products are charged to operations as incurred. Warranties. The Corporation’s construction contracts contain warranty provisions covering defects in equipment, materials, design or workmanship that generally run from nine months to one year after project completion. Due to the nature of its projects, including contract owner inspections of the work both during construction and prior to acceptance, the Corporation has not experienced material warranty costs for these short-term warranties and therefore does not believe an accrual for these costs is necessary. Certain product lines carry longer warranty periods, for which the Corporation has accrued an estimate of warranty cost based on experience with the type of work and any known risks relative to the project. These costs were not material to the Corporation’s consolidated results of operations for the years ended December 31, 2016, 2015 and 2014. Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss . Consolidated comprehensive earnings for the Corporation consist of consolidated net earnings, adjustments for the funded status of pension and postretirement benefit plans, foreign currency translation adjustments and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense, and are presented in the Corporation’s consolidated statements of comprehensive earnings. Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of the pension and postretirement benefit plans, foreign currency translation and the unamortized value of terminated forward starting interest rate swap agreements, and is presented on the Corporation’s consolidated balance sheets. The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows: Pension and Postretirement Benefit Plans Foreign Currency Unamortized Value of Terminated Forward Starting Interest Rate Swap Total years ended December 31 (add 000) 2016 Accumulated other comprehensive loss at beginning of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Other comprehensive loss before reclassifications, net of tax (31,678 ) (898 ) — (32,576 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 6,685 — 826 7,511 Other comprehensive (loss) earnings, net of tax (24,993 ) (898 ) 826 (25,065 ) Accumulated other comprehensive loss at end of period $ (128,373 ) $ (1,162 ) $ (1,152 ) $ (130,687 ) Cumulative noncurrent deferred tax assets at end of period $ 82,044 $ — $ 749 $ 82,793 2015 Accumulated other comprehensive (loss) earnings at beginning of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Other comprehensive loss before reclassifications, net of tax (7,116 ) (3,542 ) — (10,658 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 10,424 — 771 11,195 Other comprehensive earnings (loss), net of tax 3,308 (3,542 ) 771 537 Accumulated other comprehensive loss at end of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Cumulative noncurrent deferred tax assets at end of period $ 66,467 $ — $ 1,290 $ 67,757 2014 Accumulated other comprehensive (loss) earnings at beginning of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Other comprehensive loss before reclassifications, net of tax (62,726 ) (624 ) — (63,350 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 587 — 718 1,305 Other comprehensive earnings (loss), net of tax (62,139 ) (624 ) 718 (62,045 ) Accumulated other comprehensive (loss) earnings at end of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Cumulative noncurrent deferred tax assets at end of period $ 68,568 $ — $ 1,799 $ 70,367 Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2016 2015 2014 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 764 $ 2,085 $ — Settlement charge 115 — — Amortization of: Prior service credit (1,609 ) (1,880 ) (2,810 ) Actuarial loss 11,575 16,850 3,779 10,845 17,055 969 Cost of sales; Selling, general & administrative expenses Tax effect (4,160 ) (6,631 ) (382 ) Taxes on income Total $ 6,685 $ 10,424 $ 587 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,367 $ 1,280 $ 1,188 Interest expense Tax effect (541 ) (509 ) (470 ) Taxes on income Total $ 826 $ 771 $ 718 Earnings Per Common Share . The Corporation computes earnings per share (“EPS”) pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends or dividend equivalents and their respective participation rights in undistributed earnings. The Corporation pays nonforfeitable dividend equivalents during the vesting period on its restricted stock awards and incentive stock awards made prior to 2016, which results in these being considered participating securities. The numerator for basic and diluted earnings per common share is net earnings attributable to Martin Marietta, reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards issued prior to 2016. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. The following table reconciles the numerator and denominator for basic and diluted earnings per common share: years ended December 31 (add 000) 2016 2015 2014 Net earnings from continuing operations attributable to Martin Marietta $ 425,386 $ 288,792 $ 155,638 Less: Distributed and undistributed earnings attributable to unvested awards 1,775 1,252 647 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 423,611 287,540 154,991 Basic and diluted net loss attributable to common shareholders from discontinued operations — — (37 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 423,611 $ 287,540 $ 154,954 Basic weighted-average common shares outstanding 63,610 66,770 56,854 Effect of dilutive employee and director awards 251 250 234 Diluted weighted-average common shares outstanding 63,861 67,020 57,088 New Accounting Pronouncements . The Financial Accounting Standards Board (“FASB”) issued an accounting standard update on accounting for stock compensation. The new standard is effective January 1, 2017 and requires all excess tax benefits and tax deficiencies to be recorded as income tax benefit or expense in the income statement in the period the awards vest or are settled as a discrete item. Additionally, any excess tax benefits will be reflected as an operating activity in the statement of cash flows. Further, any shares withheld for personal income taxes will be classified as a financing activity in the statement of cash flows. Although the adoption of the new standard does not have a cumulative effect, it will create volatility in the Corporation’s income tax rate in periods when share-based compensation awards either vest or are exercised. The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The new standard intends to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The new standard is effective January 1, 2018 and can be applied on a full retrospective or modified retrospective approach. The Corporation has completed its initial assessment of the provisions of the new standard and, at this time, does not expect the impact to be material to its results of operations. The FASB issued an accounting standard update on accounting for leases. The new standard requires the lease rights and obligations arising from lease contracts, including existing and new arrangements, to be recognized as assets and liabilities on the balance sheet. The standard also requires additional disclosures by lessees and contains targeted changes to accounting by lessors. The new standard is effective January 1, 2019, with early adoption permitted. The guidance is required to be adopted at the earliest period presented using a modified retrospective approach. The Corporation is currently assessing the impact of the updated standard on the Corporation's financial statements. The Corporation believes the updated standard will have a material effect on its balance sheet but has not quantified the impact at this time. The FASB issued an accounting standard update on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective January 1, 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Corporation is currently evaluating the effect of the standard on its consolidated statements of cash flows.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note B: Goodwill and Other Intangible Assets The following table shows the changes in goodwill by reportable segment and in total: December 31 Mid- America Group Southeast Group West Group Cement Total (add 000) 2016 Balance at beginning of period $ 281,403 $ 50,346 $ 871,220 $ 865,266 $ 2,068,235 Acquisitions — — 91,174 — 91,174 Divestitures — — (72 ) — (72 ) Balance at end of period $ 281,403 $ 50,346 $ 962,322 $ 865,266 $ 2,159,337 2015 Balance at beginning of period $ 282,117 $ 50,346 $ 852,436 $ 883,900 $ 2,068,799 Acquisitions — — 8,464 — 8,464 Adjustments to purchase price allocations — — 15,538 (18,634 ) (3,096 ) Divestitures (714 ) — (5,218 ) — (5,932 ) Balance at end of period $ 281,403 $ 50,346 $ 871,220 $ 865,266 $ 2,068,235 Intangible assets subject to amortization consist of the following: December 31 Gross Amount Accumulated Amortization Net Balance (add 000) 2016 Noncompetition agreements $ 6,274 $ (6,106 ) $ 168 Customer relationships 45,755 (13,636 ) 32,119 Operating permits 455,095 (19,493 ) 435,602 Use rights and other 16,946 (9,239 ) 7,707 Trade names 12,800 (5,681 ) 7,119 Total $ 536,870 $ (54,155 ) $ 482,715 2015 Noncompetition agreements $ 6,274 $ (6,069 ) $ 205 Customer relationships 35,805 (10,448 ) 25,357 Operating permits 450,419 (12,294 ) 438,125 Use rights and other 16,746 (8,030 ) 8,716 Trade names 12,800 (3,408 ) 9,392 Total $ 522,044 $ (40,249 ) $ 481,795 Intangible assets deemed to have an indefinite life and not being amortized consist of the following: December 31 Aggregates Business Cement Magnesia Specialties Total (add 000) 2016 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,015 9,137 — 19,152 Trade names 280 — 2,565 2,845 Total $ 16,895 $ 9,137 $ 2,565 $ 28,597 2015 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,175 9,137 — 19,312 Trade names 280 — 2,565 2,845 Total $ 17,055 $ 9,137 $ 2,565 $ 28,757 During 2016, the Corporation acquired $15,134,000 of intangibles, consisting of the following: (add 000, except year data) Amount Weighted-average amortization period Subject to amortization: Customer relationships $ 9,950 10.3 years Operating permits 4,984 40.6 years Other 200 1.5 years Total $ 15,134 20.2 years Total amortization expense for intangible assets for the years ended December 31, 2016, 2015 and 2014 was $13,922,000, $13,962,000 and $9,311,000, respectively. The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows: (add 000) 2017 $ 14,375 2018 13,417 2019 12,107 2020 11,727 2021 11,021 Thereafter 420,068 Total $ 482,715

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Business Combinations	Note C: Business Combinations Business Combinations. In the first quarter 2016, the Corporation acquired the outstanding stock of Rocky Mountain Materials and Asphalt, Inc. and Rocky Mountain Premix, Inc. The acquisition provides more than 500 million tons of mineral reserves and expands the Corporation’s presence along the Front Range of the Rocky Mountains, home to 80% of Colorado’s population. The acquired operations are reported through the West Group. The Corporation has recorded preliminary fair values of the assets acquired and liabilities assumed; however, the transaction purchase consideration is subject to a normal post-closing working capital adjustment. Therefore, the measurement period for accounts receivable and goodwill remains open as of December 31, 2016. During the third quarter 2016, the Corporation acquired the remaining interest in Ratliff Ready-Mix, L.P. (“Ratliff”), which operates ready mixed concrete plants in central Texas. These operations are reported in the West Group. Prior to the acquisition, the Corporation owned a 40% interest in Ratliff which was accounted for under the equity method. The Corporation was required to remeasure the existing 40% interest in Ratliff at fair value upon closing of the transaction, resulting in a gain of $5,863,000, which is recorded in other nonoperating income, net. The Corporation recorded preliminary fair values of the assets acquired and liabilities assumed; however, certain amounts are subject to change upon review of the seller’s final tax return. Therefore, the measurement period for deferred income tax accounts and goodwill remains open as of December 31, 2016. The impact of these acquisitions on the operating results was not considered material; therefore, pro forma financial information is not included.

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Accounts Receivable, Net	Note D: Accounts Receivable, Net December 31 (add 000) 2016 2015 Customer receivables $ 456,508 $ 408,551 Other current receivables 7,668 9,310 464,176 417,861 Less allowances (6,266 ) (6,940 ) Total $ 457,910 $ 410,921 Of the total accounts receivable, net, balances, $2,578,000 and $3,794,000 at December 31, 2016 and 2015, respectively, were due from unconsolidated affiliates.

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventories, Net	Note E: Inventories, Net December 31 (add 000) 2016 2015 Finished products $ 479,291 $ 433,649 Products in process and raw materials 61,171 55,194 Supplies and expendable parts 116,024 110,882 656,486 599,725 Less allowances (134,862 ) (130,584 ) Total $ 521,624 $ 469,141

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	Note F: Property, Plant and Equipment, Net December 31 (add 000) 2016 2015 Land and land improvements $ 915,158 $ 865,700 Mineral reserves and interests 1,114,560 1,001,295 Buildings 151,115 144,076 Machinery and equipment 3,766,975 3,473,826 Construction in progress 167,722 128,301 6,115,530 5,613,198 Less accumulated depreciation, depletion and amortization (2,692,135 ) (2,457,198 ) Total $ 3,423,395 $ 3,156,000 The gross asset value and accumulated amortization for machinery and equipment recorded under capital leases at December 31 were as follows: (add 000) 2016 2015 Machinery and equipment under capital leases $ 23,117 $ 19,379 Less accumulated amortization (8,077 ) (5,102 ) Total $ 15,040 $ 14,277 Depreciation, depletion and amortization expense related to property, plant and equipment was $268,935,000, $246,874,000 and $211,242,000 for the years ended December 31, 2016, 2015 and 2014, respectively. Depreciation, depletion and amortization expense includes amortization of machinery and equipment under capital leases. Interest cost of $3,543,000, $5,832,000 and $8,033,000 was capitalized during 2016, 2015 and 2014, respectively. At December 31, 2016 and 2015, $58,332,000 and $58,937,000, respectively, of the Aggregates business’ net property, plant and equipment were located in foreign countries, namely the Bahamas and Canada.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	Note G: Long-Term Debt December 31 (add 000) 2016 2015 6.6% Senior Notes, due 2018 $ 299,483 $ 299,113 7% Debentures, due 2025 124,090 124,002 6.25% Senior Notes, due 2037 227,975 227,917 4.25% Senior Notes, due 2024 395,252 394,690 Floating Rate Notes, due 2017, interest rate of 2.10% and 1.71% at December 31, 2016 and 2015, respectively 299,033 298,868 Term Loan Facility, interest rate of 1.86% at December 31, 2015 - 222,521 Revolving Facility, due 2021, interest rate of 1.86% at December 31, 2016 160,000 - Trade Receivable Facility, interest rate of 1.34% at December 31, 2016 180,000 - Other notes 356 1,663 Total 1,686,189 1,568,774 Less current maturities (180,036 ) (18,713 ) Long-term debt $ 1,506,153 $ 1,550,061 The Corporation’s 6.6% Senior Notes due 2018, 7% Debentures due 2025, 6.25% Senior Notes due 2037, 4.25% Senior Notes due 2024 and Floating Rate Notes due 2017 (collectively, the “Senior Notes”) are senior unsecured obligations of the Corporation, ranking equal in right of payment with the Corporation’s existing and future unsubordinated indebtedness. Upon a change-of-control repurchase event and a resulting below-investment-grade credit rating, the Corporation would be required to make an offer to repurchase all outstanding Senior Notes, with the exception of the 7% Debentures due 2025, at a price in cash equal to 101% of the principal amount of the Senior Notes, plus any accrued and unpaid interest to, but not including, the purchase date. The Senior Notes are carried net of original issue discount, which is being amortized by the effective interest method over the life of the issue. The Senior Notes are redeemable prior to their respective maturity dates at a make-whole redemption price. The principal amount, effective interest rate and maturity date for the Corporation’s Senior Notes are as follows: Principal Amount (add 000) Effective Interest Rate Maturity Date 6.6% Senior Notes $ 300,000 6.81% April 15, 2018 7% Debentures $ 125,000 7.12% December 1, 2025 6.25% Senior Notes $ 230,000 6.45% May 1, 2037 4.25% Senior Notes $ 400,000 4.25% July 2, 2024 Floating Rate Notes $ 300,000 Three-month LIBOR+1.10% June 30, 2017 In connection with the issuance of its $300,000,000 Floating Rate Senior Notes due 2017 (the “Floating Rate Notes”) and its $400,000,000 4.25% Senior Notes due 2024 (the “4.25% Senior Notes”), the Corporation entered into an indenture, between the Corporation and Regions Bank, as trustee, and a Registration Rights Agreement, among the Corporation, Deutsche Bank Securities, Inc. and J.P. Morgan Securities, LLC, as representatives of the several initial purchasers named in Schedule I to the purchase agreement. The Floating Rate Notes bear interest at a rate equal to the three-month London Interbank Offered Rate (“LIBOR”) plus 1.10% and may not be redeemed prior to maturity. The 4.25% Senior Notes may be redeemed in whole or in part prior to their maturity at a make-whole redemption price. During the last 3 months prior to maturity, the 4.25% Senior Notes can be redeemed at par plus accrued and unpaid interest. On December 5, 2016, the Corporation entered into a new credit agreement with JPMorgan Chase Bank, N.A., as Administrative Agent, Branch Banking and Trust Company (“BB&T”), Deutsche Bank Securities, Inc., SunTrust Bank, and Wells Fargo Bank, N.A., as Co-Syndication Agents, and the lenders party thereto (the “Credit Agreement”), which provides for a $700,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”). Borrowings under the Revolving Facility bear interest, at the Corporation’s option, at rates based upon LIBOR or a base rate, plus, for each rate, a margin determined in accordance with a ratings-based pricing grid. The Revolving Facility replaced the Corporation’s credit agreement dated as of November 9, 2013 with JPMorgan Chase Bank, N.A., as Administrative Agent, BB&T, Deutsche Bank Securities, Inc., SunTrust Bank, and Wells Fargo Bank, N.A., as Co-Syndication Agents, and the lenders party thereto (the “Former Credit Agreement”). The Former Credit Agreement had provided for a term loan and a revolving facility under which $210,937,500 and $0, respectively, were outstanding prior to entering into the Revolving Facility. The Revolving Facility is syndicated with the following banks: Lender (add 000) Revolving Facility Commitment JPMorgan Chase Bank, N.A. $ 92,800 BB&T 92,800 Deutsche Bank AG New York Branch 92,800 SunTrust Bank 92,800 Wells Fargo Bank, N.A. 92,800 PNC Bank, National Association 62,000 Regions Bank 62,000 The Northern Trust Company 62,000 The Bank of Tokyo-Mitsubishi UFJ, Ltd. 30,000 Comerica Bank 20,000 Total $ 700,000 The Corporation’s Credit Agreement requires the Corporation’s ratio of consolidated net debt-to-consolidated earnings before interest, taxes, depreciation, depletion and amortization (“EBITDA”), as defined, for the trailing-twelve months (the “Ratio”) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions during the quarter or three preceding quarters so long as the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the trade receivable securitization facility (discussed later), consolidated debt, including debt for which the Corporation is a co-borrower (see Note N), may be reduced by the Corporation’s unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation. The Corporation was in compliance with this Ratio at December 31, 2016. The Revolving Facility expires on December 5, 2021, with any outstanding principal amounts, together with interest accrued thereon, due in full on that date. Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At December 31, 2016 and 2015, the Corporation had $2,507,000 of outstanding letters of credit issued under the Revolving Facility. The Corporation paid the bank group an upfront loan commitment fee that is being amortized over the life of the Revolving Facility. The Revolving Facility includes an annual facility fee. The Corporation, through a wholly-owned special-purpose subsidiary, has a trade receivable securitization facility (the “Trade Receivable Facility”). On September 28, 2016, the Corporation amended the Trade Receivable Facility to increase the borrowing capacity from $250,000,000 to $300,000,000 and extend the maturity to September 27, 2017. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, N.A., The Bank of Tokyo-Mitsubishi UFJ, Ltd., New York Branch, and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined. Borrowings are limited to the lesser of the facility limit or the borrowing base, as defined, of $333,302,000 and $282,258,000 at December 31, 2016 and 2015, respectively. These receivables are originated by the Corporation and then sold or contributed to the wholly-owned special-purpose subsidiary. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special-purpose subsidiary. Borrowings under the Trade Receivable Facility bear interest at a rate equal to one-month LIBOR plus 0.725%, subject to change in the event that this rate no longer reflects the lender’s cost of lending. The Trade Receivable Facility contains a cross-default provision to the Corporation’s other debt agreements. The Corporation’s long-term debt maturities for the five years following December 31, 2016, and thereafter are: (add 000) 2017 $ 180,035 2018 299,534 2019 55 2020 60 2021 459,098 Thereafter 747,407 Total $ 1,686,189 The Corporation’s $300,000,000 Floating Rate Notes mature June 30, 2017. The Corporation has classified these obligations as noncurrent long-term debt on the consolidated balance sheets as it has the intent to refinance the notes on a long-term basis. For the debt maturity schedule, the notes are included in 2021. The Corporation has a $5,000,000 short-term line of credit. No amounts were outstanding under this line of credit at December 31, 2016 or 2015. Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the years ended December 31, 2016, 2015 and 2014, the Corporation recognized $1,367,000, $ 1,280,000 and $1,188,000, respectively, as additional interest expense. The ongoing amortization of the terminated value of the forward starting interest rate swap agreements will increase annual interest expense by approximately $1,400,000 until the maturity of the 6.6% Senior Notes in 2018.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2016
Financial Instruments Disclosure [Abstract]
Financial Instruments	Note H: Financial Instruments The Corporation’s financial instruments include temporary cash investments, accounts receivable, notes receivable, bank overdraft, accounts payable, publicly-registered long-term notes, debentures and other long-term debt. Temporary cash investments are placed primarily in money market funds and money market demand deposit accounts with the following financial institutions: BB&T, Comerica Bank and Regions Bank. The Corporation’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. Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivable are more heavily concentrated in certain states, namely Texas, Colorado, North Carolina, Iowa and Georgia. The estimated fair values of accounts receivable approximate their carrying amounts. Notes receivable are primarily promissory notes with customers and are not publicly traded. Management estimates that the fair value of notes receivable approximates its carrying amount. The bank overdraft represents amounts to be funded to financial institutions for checks that have cleared the bank. The estimated fair value of the bank overdraft approximates its carrying value. Accounts payable represent amounts owed to suppliers and vendors. The estimated fair value of accounts payable approximates its carrying amount due to the short-term nature of the payables. The carrying values and fair values of the Corporation’s long-term debt were $1,686,189,000 and $1,752,338,000, respectively, at December 31, 2016 and $1,568,774,000 and $1,625,193,000, respectively, at December 31, 2015. The estimated fair value of the Corporation’s publicly-registered long-term debt was estimated based on Level 2 of the fair value hierarchy using quoted market prices. The estimated fair values of other borrowings, which primarily represent variable-rate debt, approximate their carrying amounts as the interest rates reset periodically.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note I: Income Taxes The components of the Corporation’s tax expense (benefit) on income from continuing operations are as follows: years ended December 31 (add 000) 2016 2015 2014 Federal income taxes: Current $ 97,975 $ 20,627 $ 35,313 Deferred 68,899 85,295 46,616 Total federal income taxes 166,874 105,922 81,929 State income taxes: Current 15,189 18,153 10,307 Deferred (1,149 ) 930 3,376 Total state income taxes 14,040 19,083 13,683 Foreign income taxes: Current 1,064 99 1,262 Deferred (394 ) (241 ) (2,027 ) Total foreign income taxes 670 (142 ) (765 ) Total taxes on income $ 181,584 $ 124,863 $ 94,847 The increase in 2016 federal current tax expense is primarily attributable to an increase in earnings; while, in comparison to 2015, the benefit from the utilization of net operating loss (“NOL”) carryforwards acquired in the 2014 purchase of TXI lowered current tax expense. The utilization of NOL carryforwards primarily attributed to the increase in federal deferred tax expense in 2015, although some benefits were also recognized in 2016 and 2014. For the years ended December 31, 2016, 2015 and 2014, the benefit related to the utilization of federal NOL carryforwards, reflected in current tax expense, was $11,852,000, $156,554,000 and $16,940,000, respectively. For the years ended December 31, 2016 and 2014, excess tax benefits attributable to stock-based compensation transactions that were recorded to shareholders’ equity amounted to $6,792,000 and $2,508,000, respectively. For the year ended December 31, 2015, the realized tax benefit for stock-based compensation transactions was $871,000 less than the amounts estimated during the vesting periods, resulting in a decrease in the pool of excess tax credits. For the year ended December 31, 2016, foreign pretax earnings were $3,865,000. For the years ended December 31, 2015 and 2014, foreign pretax loss was $1,175,000 and $10,557,000, respectively. The Corporation’s effective income tax rate on continuing operations varied from the statutory United States income tax rate because of the following permanent tax differences: years ended December 31 2016 2015 2014 Statutory tax rate 35.0 % 35.0 % 35.0 % (Reduction) increase resulting from: Effect of statutory depletion (5.4 ) (7.8 ) (9.6 ) State income taxes, net of federal tax benefit 1.5 3.0 3.6 Domestic production deduction (2.0 ) (0.1 ) (0.9 ) Transfer pricing — — (0.2 ) Goodwill write off — 0.4 3.9 Foreign tax rate differential (0.1 ) — 1.3 Disallowed compensation 0.2 0.2 3.7 Transaction costs 0.1 — 2.4 Other items 0.6 (0.5 ) (1.1 ) Effective income tax rate 29.9 % 30.2 % 38.1 % For income tax purposes, the statutory depletion deduction is calculated as a percentage of sales, subject to certain limitations. Due to these limitations, the impact of changes in the sales volumes and earnings may not proportionately affect the Corporation’s statutory depletion deduction and the corresponding impact on the effective income tax rate on continuing operations. The growth in non-depletable income has resulted in a reduced impact on the effective income tax rate related to the statutory depletion deduction. The state tax impact on the effective income tax rate has decreased due to changes in apportionment of taxable income to states with lower tax rates and the reduction in certain states’ statutory tax rates. The Corporation is entitled to receive a 9% tax deduction related to income from domestic (i.e., United States) production activities. The deduction reduced income tax expense and increased consolidated net earnings by $13,583,000, or $0.21 per diluted share, in 2016; $222,000, or less than $0.01 per diluted share, in 2015;, and $3,239,000, or $0.05 per diluted share, in 2014. The impact on the 2015 and 2014 effective income tax rate was limited by the significant utilization of NOL carryforwards. In 2015 and 2014, the Corporation wrote off goodwill not deductible for income tax purposes as part of the sale of certain operations. In addition, the Corporation incurred certain compensation and transaction expenses, primarily in 2014 in connection with the TXI acquisition, that are not deductible for income tax purposes and therefore increased the effective income tax rate. The principal components of the Corporation’s deferred tax assets and liabilities are as follows: December 31 Deferred Assets (Liabilities) (add 000) 2016 2015 Deferred tax assets related to: Employee benefits $ 61,462 $ 56,302 Inventories 71,490 75,907 Valuation and other reserves 38,206 42,857 Net operating loss carryforwards 10,507 11,448 Accumulated other comprehensive loss 82,793 67,757 AMT credit carryforward 2,771 48,197 Gross deferred tax assets 267,229 302,468 Valuation allowance on deferred tax assets (8,521 ) (8,967 ) Total net deferred tax assets 258,708 293,501 Deferred tax liabilities related to: Property, plant and equipment (635,576 ) (593,767 ) Goodwill and other intangibles (268,999 ) (266,436 ) Other items, net (17,152 ) (16,757 ) Total deferred tax liabilities (921,727 ) (876,960 ) Net deferred tax liability $ (663,019 ) $ (583,459 ) The increase in the net deferred tax liability is primarily a result of deferred taxes recorded in conjunction with stock acquisitions and the utilization of Alternative Minimum Tax (“AMT”) credit carryforwards. Deferred tax assets for employee benefits result from the temporary differences between the deductions for pension and postretirement obligations, incentive compensation and stock-based compensation transactions. For financial reporting purposes, such amounts are expensed based on authoritative accounting guidance. For income tax purposes, amounts related to pension and postretirement obligations and incentive compensation are deductible as funded. Amounts related to stock-based compensation transactions are deductible for income tax purposes upon vesting or exercise of the underlying award. The Corporation had domestic federal and state NOL carryforwards of $220,532,000 (federal $0; state $220,532,000) and $273,251,000 (federal $33,863,000; state $239,388,000) at December 31, 2016 and 2015, respectively. These carryforwards have various expiration dates through 2036. At December 31, 2016 and 2015, deferred tax assets associated with these carryforwards were $10,507,000 and $11,448,000, respectively, net of unrecognized tax benefits, for which valuation allowances of $8,303,000 and $8,690,000, respectively, were recorded. The Corporation recorded a $3,714,000 valuation reserve in 2015 for certain domestic NOL carryforwards, which was driven by the sale of the California cement operations. The Corporation also had domestic tax credit carryforwards of $1,441,000 and $3,179,000 at December 31, 2016 and 2015, respectively, which expire in 2018. At December 31, 2016 and 2015, deferred tax assets associated with these carryforwards were $937,000 and $2,509,000, respectively, net of unrecognized tax benefits, for which valuation allowances of $218,000 and $277,000 , respectively, were recorded. Deferred tax liabilities for property, plant and equipment result from accelerated depreciation methods being used for income tax purposes as compared with the straight-line method for financial reporting purposes. Deferred tax liabilities related to goodwill and other intangibles reflect the cessation of goodwill amortization for financial reporting purposes, while amortization continues for income tax purposes. The Corporation provides deferred taxes, as required, on the undistributed net earnings of all non-U.S. subsidiaries for which the indefinite reversal criterion has not been met. The Corporation expects to reinvest permanently the earnings from its wholly-owned Canadian subsidiary and accordingly, has not provided deferred taxes on the subsidiary’s undistributed net earnings. The wholly-owned Canadian subsidiary’s undistributed net earnings are estimated to be $35,392,000 at December 31, 2016. The unrecognized deferred tax liability for temporary differences related to the investment in the wholly-owned Canadian subsidiary is estimated to be $1,872,000 for the year ended December 31, 2016. The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects: years ended December 31 (add 000) 2016 2015 2014 Unrecognized tax benefits at beginning of year $ 18,727 $ 21,107 $ 11,826 Gross increases – tax positions in prior years 2,401 3,079 2,075 Gross decreases – tax positions in prior years (1,924 ) (3,512 ) (203 ) Gross increases – tax positions in current year 4,650 4,978 3,369 Gross decreases – tax positions in current year (2,047 ) (594 ) (51 ) Lapse of statute of limitations — (6,331 ) (1,872 ) Unrecognized tax benefits assumed with acquisition — — 5,963 Unrecognized tax benefits at end of year $ 21,807 $ 18,727 $ 21,107 For the year ended December 31, 2014, the unrecognized tax benefits assumed with acquisition represented positions acquired with TXI. At December 31, 2016, 2015 and 2014, unrecognized tax benefits of $11,603,000, $7,975,000 and $9,362,000, respectively, related to interest accruals and permanent income tax differences, net of federal tax benefits, would have favorably affected the Corporation’s effective income tax rate if recognized. Unrecognized tax benefits are reversed as a discrete event if an examination of applicable tax returns is not initiated by a federal or state tax authority within the statute of limitations or upon effective settlement with federal or state tax authorities. Management believes its accrual for unrecognized tax benefits is sufficient to cover uncertain tax positions reviewed during audits by taxing authorities. The Corporation anticipates that it is reasonably possible that its unrecognized tax benefits may decrease up to $3,935,000, excluding indirect benefits, during the twelve months ending December 31, 2017 due to the expiration of the statute of limitations for the 2012 and 2013 tax years. For the years ended December 31, 2015 and 2014, $2,364,000 or $0.04 per diluted share, and $687,000 or $0.01 per diluted share, respectively, were reversed into income upon the statute of limitations expiration for the 2010 and 2011 tax years. The Corporation’s open tax years subject to federal, state or foreign examinations are 2010 through 2016.

Retirement Plans, Postretiremen

Retirement Plans, Postretirement and Postemployment Benefits	12 Months Ended
	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Retirement Plans, Postretirement and Postemployment Benefits	Note J: Retirement Plans, Postretirement and Postemployment Benefits The Corporation sponsors defined benefit retirement plans that cover substantially all employees. Additionally, the Corporation provides other postretirement benefits for certain employees, including medical benefits for retirees and their spouses and retiree life insurance. The Corporation also provides certain benefits, such as disability benefits, to former or inactive employees after employment but before retirement. The measurement date for the Corporation’s defined benefit plans, postretirement benefit plans and postemployment benefit plans is December 31. Defined Benefit Retirement Plans. Retirement plan assets are invested in listed stocks, bonds, hedge funds, real estate and cash equivalents. Defined retirement benefits for salaried employees are based on each employee’s years of service and average compensation for a specified period of time before retirement. Defined retirement benefits for hourly employees are generally stated amounts for specified periods of service. The Corporation sponsors a Supplemental Excess Retirement Plan (“SERP”) that generally provides for the payment of retirement benefits in excess of allowable Internal Revenue Code limits. The SERP generally provides for a lump-sum payment of vested benefits. When these benefit payments exceed the sum of the service and interest costs for the SERP during a year, the Corporation recognizes a pro-rata portion of the SERP’s unrecognized actuarial loss as settlement expense. The net periodic retirement benefit cost of defined benefit plans includes the following components: years ended December 31 (add 000) 2016 2015 2014 Components of net periodic benefit cost: Service cost $ 22,167 $ 23,001 $ 17,125 Interest cost 35,879 33,151 28,935 Expected return on assets (37,699 ) (36,385 ) (32,661 ) Amortization of: Prior service cost 350 422 445 Actuarial loss 12,074 17,159 4,045 Transition asset (1 ) (1 ) (1 ) Settlement charge 124 — - Termination benefit charge 764 2,085 13,652 Net periodic benefit cost $ 33,658 $ 39,432 $ 31,540 The expected return on assets is based on the fair value of the plan assets. The termination benefit charge represents the increased benefits payable to former TXI executives as part of their change-in-control agreements. The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2016 2015 2014 Actuarial loss $ 52,028 $ 9,916 $ 105,546 Amortization of: Prior service cost (350 ) (422 ) (445 ) Actuarial loss (12,074 ) (17,159 ) (4,045 ) Transition asset 1 1 1 Special plan termination benefits (764 ) (2,085 ) — Settlement charge (124 ) — - Net prior service cost — 2,338 — Total $ 38,717 $ (7,411 ) $ 101,057 Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost: December 31 2016 2015 (add 000) Gross Net of tax Gross Net of tax Prior service cost $ 425 $ 261 $ 1,028 $ 628 Actuarial loss 218,056 133,083 178,770 108,874 Transition asset (7 ) (4 ) (8 ) (5 ) Total $ 218,474 $ 133,340 $ 179,790 $ 109,497 The prior service cost, actuarial loss and transition asset expected to be recognized in net periodic benefit cost during 2017 are $311,000 (net of deferred taxes of $120,000), $14,098,000 (net of deferred taxes of $5,438,000) and $1,000, respectively. These amounts are included in accumulated other comprehensive loss at December 31, 2016. The defined benefit plans’ change in projected benefit obligation is as follows: years ended December 31 (add 000) 2016 2015 Change in projected benefit obligation: Net projected benefit obligation at beginning of year $ 754,543 $ 753,975 Service cost 22,167 23,001 Interest cost 35,879 33,151 Actuarial loss (gain) 49,760 (27,119 ) Gross benefits paid (30,500 ) (30,803 ) Nonrecurring termination benefit - 2,338 Net projected benefit obligation at end of year $ 831,849 $ 754,543 The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows: years ended December 31 (add 000) 2016 2015 Change in plan assets: Fair value of plan assets at beginning of year $ 546,512 $ 524,042 Actual return on plan assets, net 35,432 (651 ) Employer contributions 44,763 53,924 Gross benefits paid (30,500 ) (30,803 ) Fair value of plan assets at end of year $ 596,207 $ 546,512 December 31 (add 000) 2016 2015 Funded status of the plan at end of year $ (235,642 ) $ (208,031 ) Accrued benefit cost $ (235,642 ) $ (208,031 ) December 31 (add 000) 2016 2015 Amounts recognized on consolidated balance sheets consist of: Current liability $ (6,223 ) $ (6,048 ) Noncurrent liability (229,419 ) (201,983 ) Net amount recognized at end of year $ (235,642 ) $ (208,031 ) The accumulated benefit obligation for all defined benefit pension plans was $752,659,000 and $688,017,000 at December 31, 2016 and 2015, respectively. Benefit obligations and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets are as follows: December 31 (add 000) 2016 2015 Projected benefit obligation $ 831,849 $ 754,543 Accumulated benefit obligation $ 752,659 $ 688,017 Fair value of plan assets $ 596,207 $ 546,512 Weighted-average assumptions used to determine benefit obligations as of December 31 are: 2016 2015 Discount rate 4.29% 4.67% Rate of increase in future compensation levels 4.50% 4.50% Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 are: 2016 2015 2014 Discount rate 4.67% 4.25% 5.17% Rate of increase in future compensation levels 4.50% 4.50% 5.00% Expected long-term rate of return on assets 7.00% 7.00% 7.00% The expected long-term rate of return on assets is based on a building-block approach, whereby the components are weighted based on the allocation of pension plan assets. For 2016 and 2015, the Corporation estimated the remaining lives of participants in the pension plans using the RP-2014 Base Table. The Corporation used mortality improvement scale MP-2016 and BB-2D for the years 2016 and 2015, respectively. The change in mortality improvement scale in 2016 did not have a material impact on the projected benefit obligation. The white-collar table was used for salaried participants and the blue-collar table, reflecting the experience of the Corporation’s participants, was used for hourly participants. The target allocation for 2016 and the actual pension plan asset allocation by asset class are as follows: Percentage of Plan Assets 2016 December 31 Asset Class Target Allocation 2016 2015 Equity securities 54% 57% 55% Debt securities 30% 28% 31% Hedge funds 8% 7% 7% Real estate 8% 8% 7% Total 100% 100% 100% The Corporation’s investment strategy is for approximately 50% of equity securities to be invested in mid-sized to large capitalization U.S. funds with the remaining to be invested in small capitalization, emerging markets and international funds. Debt securities, or fixed income investments, are invested in funds benchmarked to the Barclays U.S. Aggregate Bond Index. The fair values of pension plan assets by asset class and fair value hierarchy level are as follows: December 31 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value (add 000) 2016 Equity securities: Mid-sized to large cap $ — $ 169,176 $ — $ 169,176 Small cap, international and emerging growth funds — 169,678 — 169,678 Debt securities: Core fixed income — 168,282 — 168,282 Real estate — — 44,890 44,890 Hedge funds — — 44,036 44,036 Cash 145 — — 145 Total $ 145 $ 507,136 $ 88,926 $ 596,207 2015 Equity securities: Mid-sized to large cap $ — $ 156,008 $ — $ 156,008 Small cap, international and emerging growth funds — 144,405 — 144,405 Debt securities: Core fixed income — 167,545 — 167,545 Real estate 15,479 — 23,242 38,721 Hedge funds - — 39,219 39,219 Cash 614 — — 614 Total $ 16,093 $ 467,958 $ 62,461 $ 546,512 Level 3 real estate investments are stated at estimated fair value, which is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair values of real estate investments generally do not reflect transaction costs which may be incurred upon disposition of the real estate investments and do not necessarily represent the prices at which the real estate investments would be sold or repaid, since market prices of real estate investments can only be determined by negotiation between a willing buyer and seller. An independent valuation consultant is employed to determine the fair value of the real estate investments. The value of hedge funds is based on the values of the sub-fund investments. In determining the fair value of each sub-fund’s investment, the hedge funds’ Board of Trustees uses the values provided by the sub-funds and any other considerations that may, in its judgment, increase or decrease such estimated value. The change in the fair value of pension plan assets valued using significant unobservable inputs (Level 3) is as follows: years ended December 31 Real Estate Hedge Funds (add 000) 2016 Balance at beginning of year $ 23,242 $ 39,219 Purchases, sales, settlements, net 18,579 3,100 Actual return on plan assets held at period end 3,069 1,717 Balance at end of year $ 44,890 $ 44,036 2015 Balance at beginning of year $ 20,363 $ 38,264 Actual return on plan assets held at period end 2,879 955 Balance at end of year $ 23,242 $ 39,219 In 2016 and 2015, the Corporation made combined pension and SERP contributions of $44,763,000 and $53,924,000, respectively. The Corporation currently estimates that it will contribute $32,537,000 to its pension and SERP plans in 2017. The expected benefit payments to be paid from plan assets for each of the next five years and the five-year period thereafter are as follows: (add 000) 2017 $ 36,563 2018 $ 38,452 2019 $ 40,792 2020 $ 42,981 2021 $ 44,403 Years 2022 - 2026 $ 250,080 Postretirement Benefits . The net periodic postretirement benefit credit cost for postretirement plans includes the following components: years ended December 31 (add 000) 2016 2015 2014 Components of net periodic benefit credit: Service cost $ 85 $ 137 $ 206 Interest cost 863 928 1,164 Amortization of: Prior service credit (1,959 ) (2,302 ) (3,255 ) Actuarial gain (499 ) (309 ) (266 ) Settlement credit (9 ) - - Total net periodic benefit credit $ (1,519 ) $ (1,546 ) $ (2,151 ) The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2016 2015 2014 Actuarial loss (gain) $ 686 $ (626 ) $ (3,026 ) Net prior service credit (1,326 ) - - Settlement credit 9 - - Amortization of: Prior service credit 1,959 2,302 3,255 Actuarial gain 499 309 266 Total $ 1,827 $ 1,985 $ 495 Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit credit or cost: December 31 2016 2015 (add 000) Gross Net of tax Gross Net of tax Prior service credit $ (4,153 ) $ (2,551 ) $ (4,786 ) $ (2,924 ) Actuarial gain (3,857 ) (2,369 ) (5,050 ) (3,086 ) Total $ (8,010 ) $ (4,920 ) $ (9,836 ) $ (6,010 ) The prior service credit and actuarial gain expected to be recognized in net periodic benefit cost during 2017 is $1,741,000 (net of a deferred tax liability of $672,000) and $284,000 (net of a deferred tax liability of $110,000), respectively, and are included in accumulated other comprehensive loss at December 31, 2016. The postretirement health care plans’ change in benefit obligation is as follows: years ended December 31 (add 000) 2016 2015 Change in benefit obligation: Net benefit obligation at beginning of year $ 23,408 $ 25,086 Service cost 85 137 Interest cost 863 928 Participants’ contributions 2,616 1,777 Actuarial loss (gain) 688 (627 ) Gross benefits paid (5,743 ) (3,893 ) Plan amendments (1,326 ) - Net benefit obligation at end of year $ 20,591 $ 23,408 The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows: years ended December 31 (add 000) 2016 2015 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Employer contributions 3,127 2,116 Participants’ contributions 2,616 1,777 Gross benefits paid (5,743 ) (3,893 ) Fair value of plan assets at end of year $ — $ — December 31 (add 000) 2016 2015 Funded status of the plan at end of year $ (20,591 ) $ (23,408 ) Accrued benefit cost $ (20,591 ) $ (23,408 ) December 31 (add 000) 2016 2015 Amounts recognized on consolidated balance sheets consist of: Current liability $ (3,070 ) $ (2,120 ) Noncurrent liability (17,521 ) (21,288 ) Net amount recognized at end of year $ (20,591 ) $ (23,408 ) Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are: 2016 2015 Discount rate 3.78 % 4.25 % Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are: 2016 2015 2014 Discount rate 4.25 % 3.83 % 4.42 % For 2016 and 2015, the Corporation estimated the remaining lives of participants in the postretirement plan using the RP-2014 Base Table. The Corporation used mortality improvement scale MP-2016 and BB-2D for the years 2016 and 2015, respectively. Assumed health care cost trend rates at December 31 are: 2016 2015 Health care cost trend rate assumed for next year 7.0% 7.0% Rate to which the cost trend rate gradually declines 5.0% 5.0% Year the rate reaches the ultimate rate 2021 2020 Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects: One Percentage Point (add 000) Increase (Decrease) Total service and interest cost components $ 49 $ (42 ) Postretirement benefit obligation $ 1,051 $ (911 ) The Corporation estimates that it will contribute $3,070,000 to its postretirement health care plans in 2017. The total expected benefit payments to be paid by the Corporation, net of participant contributions, for each of the next five years and the five-year period thereafter are as follows: (add 000) 2017 $ 3,070 2018 $ 2,120 2019 $ 2,000 2020 $ 1,873 2021 $ 1,781 Years 2022 - 2026 $ 6,434 Defined Contribution Plans . The Corporation maintains defined contribution plans that cover substantially all employees. These plans, qualified under Section 401(a) of the Internal Revenue Code, are retirement savings and investment plans for the Corporation’s salaried and hourly employees Under certain provisions of these plans, the Corporation, at established rates, matches employees’ eligible contributions. The Corporation’s matching obligations were $13,235,000 in 2016, $12,444,000 in 2015 and $8,602,000 in 2014. Postemployment Benefits. The Corporation had accrued postemployment benefits of $1,146,000 and $1,267,000 at December 31, 2016 and 2015, respectively.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note K: Stock-Based Compensation The shareholders approved, on May 19, 2016, the Martin Marietta Amended and Restated Stock-Based Award Plan. The Martin Marietta Materials, Inc. Stock-Based Award Plan, as amended from time to time (along with the Amended Omnibus Securities Award Plan, originally approved in 1994, the “Plans”) is still effective for awards made prior to 2017. The Corporation has been authorized by the Board of Directors to repurchase shares of the Corporation’s common stock for issuance under the stock-based award plans (see Note M). The Corporation grants restricted stock awards under the Plans to a group of executive officers, key personnel and nonemployee Board of Directors. The vesting of certain restricted stock awards is based on certain performance criteria over a specified period of time. In addition, certain awards are granted to individuals to encourage retention and motivate key employees. These awards generally vest if the employee is continuously employed over a specified period of time and require no payment from the employee. Awards granted to nonemployee Board of Directors vest immediately. Additionally, an incentive stock plan has been adopted under the Plans whereby certain participants may elect to use up to 50% of their annual incentive compensation to acquire units representing shares of the Corporation’s common stock at a 20% discount to the market value on the date of the incentive compensation award. Certain executive officers are required to participate in the incentive stock plan at certain minimum levels. Participants earn the right to receive unrestricted shares of common stock in an amount equal to their respective units generally at the end of a 34-month period of additional employment from the date of award or at retirement beginning at age 62. All rights of ownership of the common stock convey to the participants upon the issuance of their respective shares at the end of the ownership-vesting period, with the exception of dividend equivalents that are paid on the units during the vesting period. The following table summarizes information for restricted stock awards and incentive compensation awards as of December 31, 2016: Restricted Stock - Service Based Restricted Stock - Performance Based Incentive Compensation Number of Awards Weighted- Average Grant-Date Fair Value Number of Awards Weighted- Average Grant-Date Fair Value Number of Awards Weighted- Average Grant-Date Fair Value January 1, 2016 288,563 $ 120.92 36,607 $ 117.76 37,340 $ 106.45 Awarded 73,550 $ 128.48 75,421 $ 124.41 18,570 $ 124.41 Distributed (51,849 ) $ 104.82 — $ — (14,665 ) $ 107.01 Forfeited (2,947 ) $ 129.59 (711 ) $ 124.41 (696 ) $ 108.28 December 31, 2016 307,317 $ 125.36 111,317 $ 122.22 40,549 $ 114.44 The weighted-average grant-date fair value of service-based restricted stock awards granted during 2016, 2015 and 2014 was $128.48, $154.26 and $126.88, respectively. The weighted average grant-date fair value of performance-based restricted stock awards granted during 2016, 2015 and 2014 was $124.41, $108.53 and $129.14, respectively. The weighted-average grant-date fair value of incentive compensation awards granted during 2016, 2015 and 2014 was $124.41, $108.53 and $109.17, respectively. The aggregate intrinsic values for restricted stock awards and incentive compensation awards at December 31, 2016 were $92,740,000 and $5,270,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2016, which was $221.53. The aggregate intrinsic values of restricted stock awards distributed during the years ended December 31, 2016, 2015 and 2014 were $9,738,000, $11,387,000 and $3,555,000, respectively. The aggregate intrinsic values of incentive compensation awards distributed during the years ended December 31, 2016, 2015 and 2014 were $1,941,000, $983,000 and $584,000, respectively. The aggregate intrinsic values for distributed awards were based on the closing prices of the Corporation’s common stock on the dates of distribution. Under the Plans, prior to 2016, the Corporation granted options to employees to purchase its common stock at a price equal to the closing market value at the date of grant. Options become exercisable in four annual installments beginning one year after date of grant. Options granted starting 2013 expire ten years after the grant date while outstanding options granted prior to 2013 expire eight years after the grant date. In connection with the TXI acquisition, the Corporation issued 821,282 Martin Marietta stock options (“Replacement Options”) to holders of outstanding TXI stock options at the acquisition date. The Corporation issued 0.7 Replacement Options for each outstanding TXI stock option, and the Replacement Option prices reflected the exchange ratio. The Replacement Options will expire on the original contractual dates when the TXI stock options were initially issued. Consistent with the terms of the Corporation’s other outstanding stock options, Replacement Options expire 90 days after employment is terminated. Prior to 2009, each nonemployee Board of Director member received 3,000 non-qualified stock options annually. These options have an exercise price equal to the market value at the date of grant, vested immediately and expire ten years from the grant date. The following table includes summary information for stock options as of December 31, 2016: Number of Options Weighted- Average Exercise Price Weighted-Average Remaining Contractual Life (years) Outstanding at January 1, 2016 686,012 $ 95.43 Exercised (276,240 ) $ 98.67 Terminated (2,881 ) $ 89.06 Outstanding at December 31, 2016 406,891 $ 93.27 3.9 Exercisable at December 31, 2016 324,979 $ 82.63 3.0 The weighted-average grant-date exercise price of options granted during 2015 and 2014 was $154.58 and $121.00, respectively. The aggregate intrinsic values of options exercised during the years ended December 31, 2016, 2015 and 2014 were $22,571,000, $7,318,000 and $9,709,000, respectively, and were based on the closing prices of the Corporation’s common stock on the dates of exercise. The aggregate intrinsic values for options outstanding and exercisable at December 31, 2016 were $52,189,000 and $45,138,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2016, which was $221.53. At December 31, 2016, there are approximately 941,000 awards available for grant under the Plans. In 2016, the Corporation’s shareholders approved the registration of an additional 800,000 shares of common stock under the Plans. As part of approving the registered shares, the Corporation agreed to not issue any additional awards under the legacy TXI plan. The awards available for grant under the Plans at December 31, 2016 reflect no awards available under the legacy TXI plan. In 1996, the Corporation adopted the Shareholder Value Achievement Plan to award shares of the Corporation’s common stock to key senior employees based on certain common stock performance criteria over a long-term period. Under the terms of this plan, 250,000 shares of common stock were reserved for issuance. Through December 31, 2016, 42,025 shares have been issued under this plan. No awards have been granted under this plan after 2000. The Corporation adopted and the shareholders approved the Common Stock Purchase Plan for Directors in 1996, which provides nonemployee Board of Directors the election to receive all or a portion of their total fees in the form of the Corporation’s common stock. In 2016, members of the Board of Directors were not required to defer any of their fees in the form of the Corporation’s common stock. Under the terms of this plan, 300,000 shares of common stock were reserved for issuance. Nonemployee Board of Directors elected to defer portions of their fees representing 3,699, 4,035 and 3,804 shares of the Corporation’s common stock under this plan during 2016, 2015 and 2014, respectively. The following table summarizes stock-based compensation expense for the years ended December 31, 2016, 2015 and 2014, unrecognized compensation cost for nonvested awards at December 31, 2016 and the weighted-average period over which unrecognized compensation cost will be recognized: (add 000, except year data) Stock Options Restricted Stock Incentive Compensation Directors’ Awards Total Stock-based compensation expense recognized for years ended December 31: 2016 $ 1,646 $ 17,747 $ 442 $ 646 $ 20,481 2015 $ 2,679 $ 9,809 $ 376 $ 725 13,589 2014 $ 2,020 $ 6,189 $ 257 $ 527 8,993 Unrecognized compensation cost at December 31, 2016: $ 1,045 $ 19,533 $ 340 $ — $ 20,918 Weighted-average period over which unrecognized compensation cost will be recognized: 1.6 years 2.1 years 1.5 years — For the years ended December 31, 2016, 2015 and 2014, the Corporation recognized a deferred tax asset related to stock-based compensation expense of $7,901,000, $5,286,000 and $3,542,000, respectively. The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2016: (add 000) 2017 $ 11,492 2018 7,547 2019 1,879 Total $ 20,918 Stock-based compensation expense is included in selling, general and administrative expenses in the Corporation’s consolidated statements of earnings.

Leases

Leases	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Leases	Note L: Leases Total lease expense for operating leases was $85,945,000, $80,417,000 and $59,590,000 for the years ended December 31, 2016, 2015 and 2014, respectively. The Corporation’s operating leases generally contain renewal and/or purchase options with varying terms. The Corporation has royalty agreements that generally require royalty payments based on tons produced or total sales dollars and also contain minimum payments. Total royalties, principally for leased properties, were $55,257,000, $53,658,000 and $50,535,000 for the years ended December 31, 2016, 2015 and 2014, respectively. The Corporation also has capital lease obligations for machinery and equipment. Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2016 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2017 $ 3,416 $ 125,316 2018 3,561 68,488 2019 3,241 59,727 2020 2,558 55,080 2021 1,768 51,376 Thereafter 5,216 355,918 Total 19,760 $ 715,905 Less: imputed interest (4,155 ) Present value of minimum lease payments 15,605 Less: current capital lease obligations (2,683 ) Long-term capital lease obligations $ 12,922 Of the total future minimum commitments, $225,900,000 relates to the Corporation’s contracts of affreightment.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Shareholders' Equity	Note M: Shareholders’ Equity The authorized capital structure of the Corporation includes 100,000,000 shares of common stock, with a par value of $0.01 a share. At December 31, 2016, approximately 2,164,000 common shares were reserved for issuance under stock-based plans. Pursuant to authority granted by its Board of Directors, the Corporation can repurchase up to 20,000,000 shares of common stock through open-market purchases. The Corporation repurchased 1,587,987 and 3,285,380 shares of common stock during 2016 and 2015, respectively, and did not repurchase any shares of common stock during 2014. At December 31, 2016, 15,126,633 shares of common stock were remaining under the Corporation’s repurchase authorization. In addition to common stock, the Corporation’s capital structure includes 10,000,000 shares of preferred stock with a par value of $0.01 a share. On October 21, 2006, the Board of Directors adopted a Rights Agreement (the “Rights Agreement”) and reserved 200,000 shares of Junior Participating Class B Preferred Stock for issuance. In accordance with the Rights Agreement, the Corporation issued a dividend of one right for each share of the Corporation’s common stock outstanding as of October 21, 2006, and one right continues to attach to each share of common stock issued thereafter. The rights will become exercisable if any person or group acquires beneficial ownership of 15% or more of the Corporation’s common stock. Once exercisable and upon a person or group acquiring 15% or more of the Corporation’s common stock, each right (other than rights owned by such person or group) entitles its holder to purchase, for an exercise price of $315 per share, a number of shares of the Corporation’s common stock (or in certain circumstances, cash, property or other securities of the Corporation) having a market value of twice the exercise price, and under certain conditions, common stock of an acquiring company having a market value of twice the exercise price. If any person or group acquires beneficial ownership of 15% or more of the Corporation’s common stock, the Corporation may, at its option, exchange the outstanding rights (other than rights owned by such acquiring person or group) for shares of the Corporation’s common stock or Corporation equity securities deemed to have the same value as one share of common stock or a combination thereof, at an exchange ratio of one share of common stock per right. The Corporation’s Rights Agreement expired on October 21, 2016.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note N: Commitments and Contingencies Legal and Administrative Proceedings. The Corporation is engaged in certain legal and administrative proceedings incidental to its normal business activities. In the opinion of management and counsel, based upon currently-available facts, it is remote that the ultimate outcome of any litigation and other proceedings, including those pertaining to environmental matters (see Note A), relating to the Corporation and its subsidiaries, will have a material adverse effect on the overall results of the Corporation’s operations, its cash flows or its financial position. Asset Retirement Obligations. The Corporation incurs reclamation and teardown costs as part of its mining and production processes. Estimated future obligations are discounted to their present value and accreted to their projected future obligations via charges to operating expenses. Additionally, the fixed assets recorded concurrently with the liabilities are depreciated over the period until retirement activities are expected to occur. Total accretion and depreciation expenses for 2016, 2015 and 2014 were $8,823,000, $6,767,000 and $4,584,000, respectively, and are included in other operating income and expenses, net, in the consolidated statements of earnings. The following shows the changes in the asset retirement obligations: years ended December 31: (add 000) 2016 2015 Balance at beginning of year $ 89,604 $ 70,422 Accretion expense 4,288 3,336 Liabilities incurred and liabilities assumed in business combinations 6,700 14,735 Liabilities settled 166 (4,490 ) Revisions in estimated cash flows 348 5,601 Balance at end of year $ 101,106 $ 89,604 Other Environmental Matters . The Corporation’s operations are subject to and affected by federal, state and local laws and regulations relating to the environment, health and safety and other regulatory matters. Certain of the Corporation’s operations may, from time to time, involve the use of substances that are classified as toxic or hazardous within the meaning of these laws and regulations. Environmental operating permits are, or may be, required for certain of the Corporation’s operations, and such permits are subject to modification, renewal and revocation. The Corporation regularly monitors and reviews its operations, procedures and policies for compliance with these laws and regulations. Despite these compliance efforts, risk of environmental remediation liability is inherent in the operation of the Corporation’s businesses, as it is with other companies engaged in similar businesses. The Corporation has no material provisions for environmental remediation liabilities and does not believe such liabilities will have a material adverse effect on the Corporation in the future. The United States Environmental Protection Agency (“EPA”) includes the lime industry as a national enforcement priority under the federal Clean Air Act (“CAA”). As part of the industry-wide effort, the EPA issued Notices of Violation/Findings of Violation (“NOVs”) to the Corporation in 2010 and 2011 regarding its compliance with the CAA New Source Review (“NSR”) program at its Magnesia Specialties dolomitic lime manufacturing plant in Woodville, Ohio. The Corporation has been providing information to the EPA in response to these NOVs and has had several meetings with the EPA. The Corporation believes it is in substantial compliance with the NSR program. At this time, the Corporation cannot reasonably estimate what likely penalties or upgrades to equipment might ultimately be required. The Corporation believes any costs related to any required upgrades to capital equipment will be spread over time and will not have a material adverse effect on the Corporation’s results of operations or its financial condition. Insurance Reserves. The Corporation has insurance coverage with large deductibles for workers’ compensation, automobile liability, marine liability and general liability claims. The Corporation is also self-insured for health claims. At December 31, 2016 and 2015, reserves of $42,184,000 and $45,911,000, respectively, were recorded for all such insurance claims. The Corporation carries various risk deductible workers’ compensation policies related to its workers’ compensation liabilities. The Corporation records the workers’ compensation reserves based on an actuarial-determined analysis. This analysis calculates development factors, which are applied to total reserves within the workers’ compensation program. While the Corporation believes the assumptions used to calculate these liabilities are appropriate, significant differences in actual experience and/or significant changes in these assumptions may materially affect workers’ compensation costs. Letters of Credit. In the normal course of business, the Corporation provides certain third parties with standby letter of credit agreements guaranteeing its payment for certain insurance claims, utilities and property improvements. At December 31, 2016, the Corporation was contingently liable for $45,428,000 in letters of credit, of which $2,507,000 were issued under the Corporation’s Revolving Facility. Certain of these underlying obligations are accrued on the Corporation’s consolidated balance sheets. Surety Bonds. In the normal course of business, at December 31, 2016, the Corporation was contingently liable for $381,456,000 in surety bonds required by certain states and municipalities and their related agencies. The bonds are principally for certain insurance claims, construction contracts, reclamation obligations and mining permits guaranteeing the Corporation’s own performance. Certain of these underlying obligations, including those for asset retirement requirements and insurance claims, are accrued on the Corporation’s consolidated balance sheets. Five of these bonds total $85,111,000, or 22%, of all outstanding surety bonds. The Corporation has indemnified the underwriting insurance companies, Liberty Mutual and W.R. Berkley, against any exposure under the surety bonds. In the Corporation’s past experience, no material claims have been made against these financial instruments. Borrowing Arrangements with Affiliate. The Corporation is a co-borrower with an unconsolidated affiliate for a $25,000,000 revolving line of credit agreement with BB&T, of which $22,600,000 was outstanding as of December 31, 2016 The line of credit expires in February 2018. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from this agreement. The Corporation holds a lien on the affiliate’s membership interest in a joint venture as collateral for payment under the revolving line of credit. In 2014, the Corporation loaned the unconsolidated affiliate a total of $6,000,000 as an interest-only note due December 31, 2019. Purchase Commitments. The Corporation had purchase commitments for property, plant and equipment of $94,074,000 as of December 31, 2016. The Corporation also had other purchase obligations related to energy and service contracts of $106,307,000 as of December 31, 2016. The Corporation’s contractual purchase commitments as of December 31, 2016 are as follows: (add 000) 2017 $ 154,804 2018 24,555 2019 16,453 2020 2,979 2021 454 Thereafter 1,136 Total $ 200,381 Capital expenditures in 2016, 2015 and 2014 that were purchase commitments as of the prior year end were $62,927,000, $116,681,000 and $34,135,000, respectively. Employees. Approximately 11% of the Corporation’s employees are represented by a labor union. All such employees are hourly employees. The Corporation maintains collective bargaining agreements relating to the union employees within the Aggregates business and Magnesia Specialties segment. Of the Magnesia Specialties segment, located in Manistee, Michigan and Woodville, Ohio, 100% of its hourly employees are represented by labor unions. The Manistee collective bargaining agreement expires in August 2019. The Woodville collective bargaining agreement expires in May 2018.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Business Segments	Note O: Business Segments The Aggregates business is comprised of divisions which represent operating segments. Disclosures for certain divisions are consolidated as reportable segments for financial reporting purposes as they meet the aggregation criteria. The Aggregates business contains three reportable segments: Mid-America Group, Southeast Group and West Group. The Cement and Magnesia Specialties businesses also represent individual operating and reportable segments. The accounting policies used for segment reporting are the same as those described in Note A. The Corporation’s evaluation of performance and allocation of resources are based primarily on earnings from operations. Consolidated earnings from operations include net sales less cost of sales, selling, general and administrative expenses, acquisition-related expenses, net, other operating income and expenses, net, and exclude interest expense, other nonoperating income and expenses, net, and taxes on income. Corporate consolidated earnings from operations primarily include depreciation on capitalized interest, expenses for corporate administrative functions, acquisition-related expenses, net, and other nonrecurring and/or non-operational income and expenses excluded from the Corporation’s evaluation of business segment performance and resource allocation. All debt and related interest expense is held at Corporate. Assets employed by segment include assets directly identified with those operations. Corporate assets consist primarily of cash and cash equivalents; property, plant and equipment for corporate operations; investments and other assets not directly identifiable with a reportable business segment. For the year ended December 31, 2016, the Corporation changed the presentation of the elimination of intersegment and interproduct revenues and sales. Information for the years ended December 31, 2015 and 2014 have been conformed to the 2016 presentation. The following tables display selected financial data for the Corporation’s reportable business segments . Selected Financial Data by Business Segment years ended December 31 (add 000) Total revenues 2016 2015 2014 Mid-America Group $ 1,017,098 $ 926,251 $ 848,855 Southeast Group 321,078 304,472 274,352 West Group 1,970,165 1,675,021 1,356,283 Total Aggregates Business 3,308,341 2,905,744 2,479,490 Cement 375,814 475,725 265,114 Magnesia Specialties 257,058 245,879 256,702 Less: Intersegment revenues (122,464 ) (87,778 ) (43,355 ) Total $ 3,818,749 $ 3,539,570 $ 2,957,951 Net sales Mid-America Group $ 945,123 $ 851,854 $ 770,568 Southeast Group 304,451 285,302 254,986 West Group 1,847,211 1,535,848 1,207,879 Total Aggregates Business 3,096,785 2,673,004 2,233,433 Cement 364,445 455,382 252,911 Magnesia Specialties 238,001 227,508 236,106 Less: Intersegment sales (122,464 ) (87,778 ) (43,355 ) Total $ 3,576,767 $ 3,268,116 $ 2,679,095 Gross profit (loss) Mid-America Group $ 305,794 $ 256,586 $ 216,883 Southeast Group 57,108 34,197 10,653 West Group 344,581 254,946 155,678 Total Aggregates Business 707,483 545,729 383,214 Cement 120,100 103,473 52,469 Magnesia Specialties 89,477 78,732 84,594 Corporate (8,094 ) (6,167 ) 2,083 Total $ 908,966 $ 721,767 $ 522,360 years ended December 31 (add 000) Selling, general and administrative expenses 2016 2015 2014 Mid-America Group $ 53,022 $ 52,606 $ 52,217 Southeast Group 17,325 18,467 17,788 West Group 71,531 66,639 50,147 Total Aggregates Business 141,878 137,712 120,152 Cement 24,798 26,626 12,741 Magnesia Specialties 9,694 9,499 9,776 Corporate 71,635 44,397 26,576 Total $ 248,005 $ 218,234 $ 169,245 Earnings (Loss) from operations Mid-America Group $ 257,347 $ 206,820 $ 172,208 Southeast Group 41,396 16,435 (5,293 ) West Group 277,249 205,699 153,182 Total Aggregates Business 575,992 428,954 320,097 Cement 99,362 47,821 40,751 Magnesia Specialties 79,104 68,886 74,805 Corporate (87,137 ) (66,245 ) (120,780 ) Total $ 667,321 $ 479,416 $ 314,873 Intersegment revenues and intersegment sales represent Cement business sales to the West Group’s ready mixed concrete business. years ended December 31 (add 000) Assets employed 2016 2015 2014 Mid-America Group $ 1,406,526 $ 1,304,574 $ 1,290,833 Southeast Group 594,967 583,369 604,044 West Group 2,981,701 2,621,636 2,444,400 Total Aggregates Business 4,983,194 4,509,579 4,339,277 Cement 1,922,317 1,939,796 2,451,799 Magnesia Specialties 150,969 147,795 150,359 Corporate 244,425 360,441 273,082 Total $ 7,300,905 $ 6,957,611 $ 7,214,517 Depreciation, depletion and amortization Mid-America Group $ 64,295 $ 61,693 $ 63,294 Southeast Group 30,590 31,644 31,955 West Group 119,819 93,947 74,283 Total Aggregates Business 214,704 187,284 169,532 Cement 44,834 53,672 30,620 Magnesia Specialties 12,865 13,769 10,394 Corporate 12,850 8,862 12,200 Total $ 285,253 $ 263,587 $ 222,746 years ended December 31 (add 000) Total property additions 2016 2015 2014 Mid-America Group $ 152,014 $ 77,640 $ 76,753 Southeast Group 30,588 12,155 23,326 West Group 310,162 235,245 753,342 Total Aggregates Business 492,764 325,040 853,421 Cement 28,633 9,599 975,063 Magnesia Specialties 8,944 8,916 2,588 Corporate 10,430 20,561 15,349 Total $ 540,771 $ 364,116 $ 1,846,421 Property additions through acquisitions Mid-America Group $ 1,524 $ 4,385 $ — Southeast Group — — — West Group 132,112 35,965 632,560 Total Aggregates Business 133,636 40,350 632,560 Cement — — 970,300 Magnesia Specialties — — — Corporate — — — Total $ 133,636 $ 40,350 $ 1,602,860 The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include the asphalt/paving and ready mixed concrete product lines. All aggregates-related downstream product lines reside in the West Group. The following tables, which are reconciled to consolidated amounts, provide total revenues, net sales and gross profit by line of business: Aggregates (further divided by product line), Cement and Magnesia Specialties. Interproduct revenues and interproduct sales represent sales from the aggregates product line to the asphalt/paving and ready mixed concrete product lines.. Intersegment revenues and intersegment sales represent cement product lines sales to the ready mixed concrete product line. years ended December 31 (add 000) Total revenues 2016 2015 2014 Aggregates $ 2,267,574 $ 2,120,245 $ 1,880,074 Asphalt/Paving 345,134 290,966 303,777 Ready Mixed Concrete 903,803 657,831 431,383 Less: Interproduct revenues (208,170 ) (163,298 ) (135,744 ) Total Aggregates Business 3,308,341 2,905,744 2,479,490 Cement 375,814 475,725 265,114 Magnesia Specialties 257,058 245,879 256,702 Less: Intersegment revenues (122,464 ) (87,778 ) (43,355 ) Total $ 3,818,749 $ 3,539,570 $ 2,957,951 Net sales Aggregates $ 2,060,876 $ 1,896,143 $ 1,644,265 Asphalt/Paving 341,444 283,628 294,239 Ready Mixed Concrete 902,635 656,531 430,673 Less: Interproduct sales (208,170 ) (163,298 ) (135,744 ) Total Aggregates Business 3,096,785 2,673,004 2,233,433 Cement 364,445 455,382 252,911 Magnesia Specialties 238,001 227,508 236,106 Less: Intersegment sales (122,464 ) (87,778 ) (43,355 ) Total $ 3,576,767 $ 3,268,116 $ 2,679,095 Gross profit (loss) Aggregates $ 554,801 $ 467,053 $ 324,093 Asphalt/Paving 53,569 35,734 19,992 Ready Mixed Concrete 99,113 42,942 39,129 Total Aggregates Business 707,483 545,729 383,214 Cement 120,100 103,473 52,469 Magnesia Specialties 89,477 78,732 84,594 Corporate (8,094 ) (6,167 ) 2,083 Total $ 908,966 $ 721,767 $ 522,360 Domestic and foreign total revenues are as follows: years ended December 31 (add 000) 2016 2015 2014 Domestic $ 3,761,651 $ 3,493,462 $ 2,912,115 Foreign 57,098 46,108 45,836 Total $ 3,818,749 $ 3,539,570 $ 2,957,951

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Note P: Supplemental Cash Flow Information The components of the change in other assets and liabilities, net, are as follows: years ended December 31 (add 000) 2016 2015 2014 Other current and noncurrent assets $ 9,171 $ (3,631 ) $ 8,066 Accrued salaries, benefits and payroll taxes 13,155 (12,303 ) 10,136 Accrued insurance and other taxes (2,688 ) 4,425 (17,641 ) Accrued income taxes (12,523 ) (4,364 ) 27,680 Accrued pension, postretirement and postemployment benefits (15,955 ) (18,153 ) 1,150 Other current and noncurrent liabilities (6,053 ) (3,014 ) (10,681 ) Change in other assets and liabilities, net $ (14,893 ) $ (37,040 ) $ 18,710 The changes in accrued salaries, benefits and payroll taxes reflect an increase in accrued incentive compensation in 2016, TXI-related severance payments of $9,682,000 in 2015 and TXI-related severance accrual of $11,444,000 in 2014. The changes in accrued income taxes reflects the utilization of deferred tax assets related to the AMT credit carryforward in 2016 and NOL carryforwards in 2016 and 2015. Additionally, in 2015, the Corporation received the federal tax refunds attributable to the settlement of the U.S. Advanced Pricing Agreement. The change in accrued pension, postretirement and postemployment benefits in 2015 was attributable to higher pension plan funding, which increased $28,270,000. Noncash investing and financing activities are as follows: years ended December 31 (add 000) 2016 2015 2014 Noncash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 38,566 $ 22,285 $ 31,172 Acquisition of assets through capital lease $ 1,399 $ 1,445 $ 7,788 Acquisition of assets through asset exchange $ — $ 5,000 $ 2,091 Seller financing of land purchase $ — $ — $ 1,500 Acquisition of TXI net assets assumed through issuances of common stock and options $ — $ — $ 2,691,986 Supplemental disclosures of cash flow information are as follows: years ended December 31 (add 000) 2016 2015 2014 Cash paid for interest $ 73,664 $ 71,011 $ 81,304 Cash paid for income taxes $ 124,342 $ 46,774 $ 15,955

SCHEDULE II - Valuation and Qua

SCHEDULE II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Valuation And Qualifying Accounts [Abstract]
SCHEDULE II - Valuation and Qualifying Accounts	SCHEDULE II — MARTIN MARIETTA MATERIALS, INC. AND CONSOLIDATED SUBSIDIARIES Col A Col B Col C Col D Col E Additions Description Balance at beginning of period (1) Charged to costs and expenses (2) Charged to other accounts- describe Deductions-describe Balance at end of period (Amounts in Thousands) Year ended December 31, 2016 Allowance for doubtful accounts $ 6,940 $ - $ - $ 674 $ 6,266 Allowance for uncollectible notes receivable 585 - - 148 (a) 437 Inventory valuation allowance 130,584 4,160 118 (c) 0 134,862 Year ended December 31, 2015 Allowance for doubtful accounts $ 4,077 $ 2,863 $ - $ - $ 6,940 Allowance for uncollectible notes receivable 1486 - - 901 (a) 585 Inventory valuation allowance 119,189 13,365 1,400 (c) 3,370 (d) 130,584 Year ended December 31, 2014 Allowance for doubtful accounts $ 4,081 $ - $ - $ 4 (a) $ 4,077 Allowance for uncollectible notes receivable 809 0 1,103 (b) 426 (a) 1486 Inventory valuation allowance 99,026 11,762 9,942 (c) 1,541 (d) 119,189 (a) Write off of uncollectible accounts and change in estimates. (b) Application of reserves to acquired notes receivable. (c) Application of reserve policy to acquired inventories. (d) Divestitures.

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Organization	Organization. Martin Marietta Materials, Inc., (the “Corporation” or “Martin Marietta”) is engaged principally in the construction aggregates business. The aggregates product line includes crushed stone, sand and gravel, and is used for the construction of infrastructure, nonresidential and residential projects. Aggregates products are also used for railroad ballast, and in agricultural, utility and environmental applications. These aggregates products, along with the Corporation’s aggregates-related downstream product lines, namely heavy building materials such as asphalt products, ready mixed concrete and road paving construction services, are sold and shipped from a network of more than 400 quarries, distribution facilities and plants to customers in 29 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and aggregates-related downstream product lines are reported collectively as the “Aggregates business”. As of December 31, 2016, the Aggregates business contains the following reportable segments: Mid-America Group, Southeast Group and West Group. The Mid-America Group operates in Indiana, Iowa, northern Kansas, Kentucky, Maryland, Minnesota, Missouri, eastern Nebraska, North Carolina, Ohio, South Carolina, Virginia, Washington and West Virginia. The Southeast Group has operations in Alabama, Florida, Georgia, Tennessee, Nova Scotia and the Bahamas. The West Group operates in Arkansas, Colorado, southern Kansas, Louisiana, western Nebraska, Nevada, Oklahoma, Texas, Utah and Wyoming. The following states accounted for 73% of the Aggregates business’ 2016 net sales: Texas, Colorado, North Carolina, Iowa and Georgia. The Cement segment produces Portland and specialty cements at two plants in Texas. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. The Magnesia Specialties segment, with production facilities in Ohio and Michigan, produces magnesia-based chemicals products used in industrial, agricultural and environmental applications, and dolomitic lime sold primarily to customers in the steel industry.
Use of Estimates	Use of Estimates. The preparation of the Corporation’s consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets and other long-lived assets and assumptions used in the calculation of taxes on income, retirement and other postemployment benefits, and the allocation of the purchase price to the fair values of assets acquired and liabilities assumed as part of business combinations. These estimates and assumptions are based on management’s judgment. Management evaluates estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, and adjusts such estimates and assumptions when facts and circumstances dictate. Changes in credit, equity and energy markets and changes in construction activity increase the uncertainty inherent in certain estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the consolidated financial statements for the period in which the change in estimate occurs.
Basis of Consolidation	Basis of Consolidation . The consolidated financial statements include the accounts of the Corporation and its wholly-owned and majority-owned subsidiaries. Partially-owned affiliates are either consolidated or accounted for at cost or as equity investments, depending on the level of ownership interest or the Corporation’s ability to exercise control over the affiliates’ operations. Intercompany balances and transactions have been eliminated in consolidation.
Revenue Recognition	Revenue Recognition . Total revenues include sales of materials and services provided to customers, net of discounts or allowances, if any, and include freight and delivery costs billed to customers. Revenues for product sales are recognized when risks associated with ownership have passed to unaffiliated customers. Typically, this occurs when finished products are shipped. Revenues derived from the road paving business are recognized using the percentage-of-completion method under the revenue-cost approach. Under the revenue-cost approach, recognized contract revenue equals the total estimated contract revenue multiplied by the percentage of completion. Recognized costs equal the total estimated contract cost multiplied by the percentage of completion. The percentage of completion is determined by costs incurred to date as a percentage of total costs estimated for the project.
Freight and Delivery Costs	Freight and Delivery Costs . Freight and delivery costs represent pass-through transportation costs incurred and paid by the Corporation to third-party carriers to deliver products to customers. These costs are then billed to the customers.
Cash and Cash Equivalents	Cash and Cash Equivalents . Cash equivalents are comprised of highly-liquid instruments with original maturities of three months or less from the date of purchase. The Corporation manages its cash and cash equivalents to ensure short-term operating cash needs are met and excess funds are managed efficiently. The Corporation subsidizes shortages in operating cash through credit facilities. The Corporation utilizes excess cash to either pay down credit facility borrowings or invest in money market funds, money market demand deposit accounts or Eurodollar time deposit accounts. Money market demand deposits and Eurodollar time deposit accounts are exposed to bank solvency risk. Money market demand deposit accounts are FDIC insured up to $250,000. The Corporation’s deposits in bank funds generally exceed the $250,000 FDIC insurance limit. The Corporation’s cash management policy prohibits cash and cash equivalents over $100,000,000 to be maintained at any one bank.
Customer Receivables	Customer Receivables. Customer receivables are stated at cost. The Corporation does not typically charge interest on customer accounts receivables. The Corporation records an allowance for doubtful accounts, which includes a provision for probable losses based on historical write offs and a specific reserve for accounts greater than $50,000 deemed at risk. The Corporation writes off customer receivables as bad debt expense when it becomes apparent based upon customer facts and circumstances that such amounts will not be collected.
Inventories Valuation	Inventories Valuation . Inventories are stated at the lower of cost or net realizable value. Costs for finished products and in process inventories are determined by the first-in, first-out method. The Corporation records an allowance for finished product inventories in excess of sales for a twelve-month period, as measured by historical sales. The Corporation also establishes an allowance for expendable parts over five years old and supplies over one year old. Post-production stripping costs, which represent costs of removing overburden and waste materials to access mineral deposits, are a component of inventory production costs and recognized in cost of sales in the same period as the revenue from the sale of the inventory.
Properties and Depreciation	Properties and Depreciation . Property, plant and equipment are stated at cost. The estimated service lives for property, plant and equipment are as follows: Class of Assets Range of Service Lives Buildings 5 to 20 years Machinery & Equipment 2 to 20 years Land Improvements 5 to 15 years The Corporation begins capitalizing quarry development costs at a point when reserves are determined to be proven or probable, economically mineable and when demand supports investment in the market. Capitalization of these costs ceases when production commences. Capitalized quarry development costs are classified as land improvements. The Corporation reviews relevant facts and circumstances to determine whether to capitalize or expense pre-production stripping costs when additional pits are developed at an existing quarry. If the additional pit operates in a separate and distinct area of the quarry, these costs are capitalized as quarry development costs and depreciated over the life of the uncovered reserves. Additionally, a separate asset retirement obligation is created for additional pits when the liability is incurred. Once a pit enters the production phase, all post-production stripping costs are charged to inventory production costs as incurred. Mineral reserves and mineral interests acquired in connection with a business combination are valued using an income approach over the life of the reserves. Depreciation is computed over estimated service lives, principally by the straight-line method. Depletion of mineral reserves is calculated over proven and probable reserves by the units-of-production method on a quarry-by-quarry basis. Property, plant and equipment are reviewed for impairment whenever facts and circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized if expected future undiscounted cash flows over the estimated remaining service life of the related asset are less than the asset’s carrying value.
Repair and Maintenance Costs	Repair and Maintenance Costs. Repair and maintenance costs that do not substantially extend the life of the Corporation’s plant and equipment are expensed as incurred.
Goodwill and Intangible Assets	Goodwill and Intangible Assets. Goodwill represents the excess purchase price paid for acquired businesses over the estimated fair value of identifiable assets and liabilities. Other intangibles represent amounts assigned principally to contractual agreements and are amortized ratably over periods based on related contractual terms. The Corporation’s reporting units, which represent the level at which goodwill is tested for impairment, are based on the geographic regions of the Aggregates business. Additionally, the Cement business is a separate reporting unit. Goodwill is allocated to each reporting unit based on the location of acquisitions and divestitures at the time of consummation. The carrying values of goodwill and other indefinite-lived intangible assets are reviewed annually, as of October 1, for impairment. An interim review is performed between annual tests if facts or circumstances indicate potential impairment. The carrying value of other amortizable intangibles is reviewed if facts and circumstances indicate potential impairment. If a review indicates the carrying value is impaired, a charge is recorded.
Retirement Plans and Postretirement Benefits	Retirement Plans and Postretirement Benefits. The Corporation sponsors defined benefit retirement plans and also provides other postretirement benefits. The Corporation recognizes the funded status, defined as the difference between the fair value of plan assets and the benefit obligation, of its pension plans and other postretirement benefits as an asset or liability on the consolidated balance sheets. Actuarial gains or losses that arise during the year are not recognized as net periodic benefit cost in the same year, but rather are recognized as a component of accumulated other comprehensive earnings or loss. Those amounts are amortized over the participants’ average remaining service period and recognized as a component of net periodic benefit cost. The amount amortized is determined using a corridor approach and represents the excess over 10% of the greater of the projected benefit obligation or pension plan assets.
Stock-Based Compensation	Stock-Based Compensation. The Corporation has stock-based compensation plans for employees and its Board of Directors. The Corporation recognizes all forms of stock-based payments to employees, including stock options, as compensation expense. The compensation expense is the fair value of the awards at the measurement date and is recognized over the requisite service period. The fair value of restricted stock awards, incentive compensation awards and Board of Directors’ fees paid in the form of common stock are based on the closing price of the Corporation’s common stock on the awards’ respective grant dates. The fair value of performance stock awards based on total shareholder return is determined by a Monte Carlo simulation methodology. In 2016, the Corporation did not issue any stock options. For stock options issued prior to 2016, the Corporation uses the accelerated expense recognition method. The accelerated recognition method requires stock options that vest ratably to be divided into tranches. The expense for each tranche is allocated to its particular vesting period. The Corporation uses the lattice valuation model to determine the fair value of stock option awards. The lattice valuation model takes into account employees’ exercise patterns based on changes in the Corporation’s stock price and other variables. The period of time for which options are expected to be outstanding, or expected term of the option, is a derived output of the lattice valuation model. The Corporation considers the following factors when estimating the expected term of options: vesting period of the award, expected volatility of the underlying stock, employees’ ages and external data. Key assumptions used in determining the fair value of the stock options awarded in 2015 and 2014 were: 2015 2014 Risk-free interest rate 2.20% 2.50% Dividend yield 1.20% 1.50% Volatility factor 36.10% 35.30% Expected term 8.5 years 8.5 years Based on these assumptions, the weighted-average fair value of each stock option granted was $57.71 and $43.42 for 2015 and 2014, respectively. The risk-free interest rate reflects the interest rate on zero-coupon U.S. government bonds, available at the time each option was granted, having a remaining life approximately equal to the option’s expected life. The dividend yield represents the dividend rate expected to be paid over the option’s expected life. The Corporation’s volatility factor measures the amount by which its stock price is expected to fluctuate during the expected life of the option and is based on historical stock price changes. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Corporation estimates forfeitures and will ultimately recognize compensation cost only for those stock-based awards that vest. For restricted stock awards and incentive stock awards granted prior to 2016, the Corporation recognizes income tax benefits resulting from the payment of dividend equivalents on unvested stock-based payments as an increase to additional paid-in capital and includes them in the pool of excess tax benefits. For awards granted in 2016, dividend equivalents are not paid unless the award vests.
Environmental Matters	Environmental Matters. The Corporation records a liability for an asset retirement obligation at fair value in the period in which it is incurred. The asset retirement obligation is recorded at the acquisition date of a long-lived tangible asset if the fair value can be reasonably estimated. A corresponding amount is capitalized as part of the asset’s carrying amount. The fair value is affected by management’s assumptions regarding the scope of the work required, inflation rates and quarry closure dates. Further, the Corporation records an accrual for other environmental remediation liabilities in the period in which it is probable that a liability has been incurred and the appropriate amounts can be estimated reasonably. Such accruals are adjusted as further information develops or circumstances change. These costs are not discounted to their present value or offset for potential insurance or other claims or potential gains from future alternative uses for a site.
Income Taxes	Income Taxes . Deferred income taxes, net, on the consolidated balance sheets reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, net of valuation allowances.
Uncertain Tax Positions	Uncertain Tax Positions. The Corporation recognizes a tax benefit when it is more-likely-than-not, based on the technical merits, that a tax position would be sustained upon examination by a taxing authority. The amount to be recognized is measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. The Corporation’s unrecognized tax benefits are recorded in other liabilities on the consolidated balance sheets or as an offset to the deferred tax asset for tax carryforwards where available. The Corporation records interest accrued in relation to unrecognized tax benefits as income tax expense. Penalties, if incurred, are recorded as operating expenses in the consolidated statements of earnings.
Sales Taxes	Sales Taxes. Sales taxes collected from customers are recorded as liabilities until remitted to taxing authorities and therefore are not reflected in the consolidated statements of earnings.
Research and Development Costs	Research and Development Costs. Research and development costs are charged to operations as incurred.
Start-Up Costs	Start-Up Costs. Noncapital start-up costs for new facilities and products are charged to operations as incurred.
Warranties	Warranties. The Corporation’s construction contracts contain warranty provisions covering defects in equipment, materials, design or workmanship that generally run from nine months to one year after project completion. Due to the nature of its projects, including contract owner inspections of the work both during construction and prior to acceptance, the Corporation has not experienced material warranty costs for these short-term warranties and therefore does not believe an accrual for these costs is necessary. Certain product lines carry longer warranty periods, for which the Corporation has accrued an estimate of warranty cost based on experience with the type of work and any known risks relative to the project. These costs were not material to the Corporation’s consolidated results of operations for the years ended December 31, 2016, 2015 and 2014.
Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss	Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss . Consolidated comprehensive earnings for the Corporation consist of consolidated net earnings, adjustments for the funded status of pension and postretirement benefit plans, foreign currency translation adjustments and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense, and are presented in the Corporation’s consolidated statements of comprehensive earnings. Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of the pension and postretirement benefit plans, foreign currency translation and the unamortized value of terminated forward starting interest rate swap agreements, and is presented on the Corporation’s consolidated balance sheets. The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows: Pension and Postretirement Benefit Plans Foreign Currency Unamortized Value of Terminated Forward Starting Interest Rate Swap Total years ended December 31 (add 000) 2016 Accumulated other comprehensive loss at beginning of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Other comprehensive loss before reclassifications, net of tax (31,678 ) (898 ) — (32,576 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 6,685 — 826 7,511 Other comprehensive (loss) earnings, net of tax (24,993 ) (898 ) 826 (25,065 ) Accumulated other comprehensive loss at end of period $ (128,373 ) $ (1,162 ) $ (1,152 ) $ (130,687 ) Cumulative noncurrent deferred tax assets at end of period $ 82,044 $ — $ 749 $ 82,793 2015 Accumulated other comprehensive (loss) earnings at beginning of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Other comprehensive loss before reclassifications, net of tax (7,116 ) (3,542 ) — (10,658 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 10,424 — 771 11,195 Other comprehensive earnings (loss), net of tax 3,308 (3,542 ) 771 537 Accumulated other comprehensive loss at end of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Cumulative noncurrent deferred tax assets at end of period $ 66,467 $ — $ 1,290 $ 67,757 2014 Accumulated other comprehensive (loss) earnings at beginning of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Other comprehensive loss before reclassifications, net of tax (62,726 ) (624 ) — (63,350 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 587 — 718 1,305 Other comprehensive earnings (loss), net of tax (62,139 ) (624 ) 718 (62,045 ) Accumulated other comprehensive (loss) earnings at end of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Cumulative noncurrent deferred tax assets at end of period $ 68,568 $ — $ 1,799 $ 70,367 Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2016 2015 2014 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 764 $ 2,085 $ — Settlement charge 115 — — Amortization of: Prior service credit (1,609 ) (1,880 ) (2,810 ) Actuarial loss 11,575 16,850 3,779 10,845 17,055 969 Cost of sales; Selling, general & administrative expenses Tax effect (4,160 ) (6,631 ) (382 ) Taxes on income Total $ 6,685 $ 10,424 $ 587 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,367 $ 1,280 $ 1,188 Interest expense Tax effect (541 ) (509 ) (470 ) Taxes on income Total $ 826 $ 771 $ 718
Earnings Per Common Share	Earnings Per Common Share . The Corporation computes earnings per share (“EPS”) pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends or dividend equivalents and their respective participation rights in undistributed earnings. The Corporation pays nonforfeitable dividend equivalents during the vesting period on its restricted stock awards and incentive stock awards made prior to 2016, which results in these being considered participating securities. The numerator for basic and diluted earnings per common share is net earnings attributable to Martin Marietta, reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards issued prior to 2016. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. The following table reconciles the numerator and denominator for basic and diluted earnings per common share: years ended December 31 (add 000) 2016 2015 2014 Net earnings from continuing operations attributable to Martin Marietta $ 425,386 $ 288,792 $ 155,638 Less: Distributed and undistributed earnings attributable to unvested awards 1,775 1,252 647 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 423,611 287,540 154,991 Basic and diluted net loss attributable to common shareholders from discontinued operations — — (37 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 423,611 $ 287,540 $ 154,954 Basic weighted-average common shares outstanding 63,610 66,770 56,854 Effect of dilutive employee and director awards 251 250 234 Diluted weighted-average common shares outstanding 63,861 67,020 57,088
New Accounting Pronouncements	New Accounting Pronouncements . The Financial Accounting Standards Board (“FASB”) issued an accounting standard update on accounting for stock compensation. The new standard is effective January 1, 2017 and requires all excess tax benefits and tax deficiencies to be recorded as income tax benefit or expense in the income statement in the period the awards vest or are settled as a discrete item. Additionally, any excess tax benefits will be reflected as an operating activity in the statement of cash flows. Further, any shares withheld for personal income taxes will be classified as a financing activity in the statement of cash flows. Although the adoption of the new standard does not have a cumulative effect, it will create volatility in the Corporation’s income tax rate in periods when share-based compensation awards either vest or are exercised. The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The new standard intends to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The new standard is effective January 1, 2018 and can be applied on a full retrospective or modified retrospective approach. The Corporation has completed its initial assessment of the provisions of the new standard and, at this time, does not expect the impact to be material to its results of operations. The FASB issued an accounting standard update on accounting for leases. The new standard requires the lease rights and obligations arising from lease contracts, including existing and new arrangements, to be recognized as assets and liabilities on the balance sheet. The standard also requires additional disclosures by lessees and contains targeted changes to accounting by lessors. The new standard is effective January 1, 2019, with early adoption permitted. The guidance is required to be adopted at the earliest period presented using a modified retrospective approach. The Corporation is currently assessing the impact of the updated standard on the Corporation's financial statements. The Corporation believes the updated standard will have a material effect on its balance sheet but has not quantified the impact at this time. The FASB issued an accounting standard update on the classification of certain cash receipts and payments in the statement of cash flows intended to reduce diversity in practice. The guidance is effective January 1, 2018. Early adoption is permitted. The guidance is to be applied retrospectively to all periods presented but may be applied prospectively if retrospective application would be impracticable. The Corporation is currently evaluating the effect of the standard on its consolidated statements of cash flows.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Estimated Service Lives for Property Plant and Equipment	The estimated service lives for property, plant and equipment are as follows: Class of Assets Range of Service Lives Buildings 5 to 20 years Machinery & Equipment 2 to 20 years Land Improvements 5 to 15 years
Summary of Key Assumptions Used in Determining Fair Value of Stock Options Awarded	Key assumptions used in determining the fair value of the stock options awarded in 2015 and 2014 were: 2015 2014 Risk-free interest rate 2.20% 2.50% Dividend yield 1.20% 1.50% Volatility factor 36.10% 35.30% Expected term 8.5 years 8.5 years
Components of Changes in Accumulated Other Comprehensive Loss and Related Cumulative Noncurrent Deferred Tax Assets	The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows: Pension and Postretirement Benefit Plans Foreign Currency Unamortized Value of Terminated Forward Starting Interest Rate Swap Total years ended December 31 (add 000) 2016 Accumulated other comprehensive loss at beginning of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Other comprehensive loss before reclassifications, net of tax (31,678 ) (898 ) — (32,576 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 6,685 — 826 7,511 Other comprehensive (loss) earnings, net of tax (24,993 ) (898 ) 826 (25,065 ) Accumulated other comprehensive loss at end of period $ (128,373 ) $ (1,162 ) $ (1,152 ) $ (130,687 ) Cumulative noncurrent deferred tax assets at end of period $ 82,044 $ — $ 749 $ 82,793 2015 Accumulated other comprehensive (loss) earnings at beginning of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Other comprehensive loss before reclassifications, net of tax (7,116 ) (3,542 ) — (10,658 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 10,424 — 771 11,195 Other comprehensive earnings (loss), net of tax 3,308 (3,542 ) 771 537 Accumulated other comprehensive loss at end of period $ (103,380 ) $ (264 ) $ (1,978 ) $ (105,622 ) Cumulative noncurrent deferred tax assets at end of period $ 66,467 $ — $ 1,290 $ 67,757 2014 Accumulated other comprehensive (loss) earnings at beginning of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Other comprehensive loss before reclassifications, net of tax (62,726 ) (624 ) — (63,350 ) Amounts reclassified from accumulated other comprehensive loss, net of tax 587 — 718 1,305 Other comprehensive earnings (loss), net of tax (62,139 ) (624 ) 718 (62,045 ) Accumulated other comprehensive (loss) earnings at end of period $ (106,688 ) $ 3,278 $ (2,749 ) $ (106,159 ) Cumulative noncurrent deferred tax assets at end of period $ 68,568 $ — $ 1,799 $ 70,367
Reclassification Out of Accumulated Other Comprehensive Loss	Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2016 2015 2014 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 764 $ 2,085 $ — Settlement charge 115 — — Amortization of: Prior service credit (1,609 ) (1,880 ) (2,810 ) Actuarial loss 11,575 16,850 3,779 10,845 17,055 969 Cost of sales; Selling, general & administrative expenses Tax effect (4,160 ) (6,631 ) (382 ) Taxes on income Total $ 6,685 $ 10,424 $ 587 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,367 $ 1,280 $ 1,188 Interest expense Tax effect (541 ) (509 ) (470 ) Taxes on income Total $ 826 $ 771 $ 718
Basic and Diluted Earnings Per Common Share	The following table reconciles the numerator and denominator for basic and diluted earnings per common share: years ended December 31 (add 000) 2016 2015 2014 Net earnings from continuing operations attributable to Martin Marietta $ 425,386 $ 288,792 $ 155,638 Less: Distributed and undistributed earnings attributable to unvested awards 1,775 1,252 647 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 423,611 287,540 154,991 Basic and diluted net loss attributable to common shareholders from discontinued operations — — (37 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 423,611 $ 287,540 $ 154,954 Basic weighted-average common shares outstanding 63,610 66,770 56,854 Effect of dilutive employee and director awards 251 250 234 Diluted weighted-average common shares outstanding 63,861 67,020 57,088

Goodwill and Other Intangible30

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Goodwill	The following table shows the changes in goodwill by reportable segment and in total: December 31 Mid- America Group Southeast Group West Group Cement Total (add 000) 2016 Balance at beginning of period $ 281,403 $ 50,346 $ 871,220 $ 865,266 $ 2,068,235 Acquisitions — — 91,174 — 91,174 Divestitures — — (72 ) — (72 ) Balance at end of period $ 281,403 $ 50,346 $ 962,322 $ 865,266 $ 2,159,337 2015 Balance at beginning of period $ 282,117 $ 50,346 $ 852,436 $ 883,900 $ 2,068,799 Acquisitions — — 8,464 — 8,464 Adjustments to purchase price allocations — — 15,538 (18,634 ) (3,096 ) Divestitures (714 ) — (5,218 ) — (5,932 ) Balance at end of period $ 281,403 $ 50,346 $ 871,220 $ 865,266 $ 2,068,235
Intangible Assets Subject to Amortization	Intangible assets subject to amortization consist of the following: December 31 Gross Amount Accumulated Amortization Net Balance (add 000) 2016 Noncompetition agreements $ 6,274 $ (6,106 ) $ 168 Customer relationships 45,755 (13,636 ) 32,119 Operating permits 455,095 (19,493 ) 435,602 Use rights and other 16,946 (9,239 ) 7,707 Trade names 12,800 (5,681 ) 7,119 Total $ 536,870 $ (54,155 ) $ 482,715 2015 Noncompetition agreements $ 6,274 $ (6,069 ) $ 205 Customer relationships 35,805 (10,448 ) 25,357 Operating permits 450,419 (12,294 ) 438,125 Use rights and other 16,746 (8,030 ) 8,716 Trade names 12,800 (3,408 ) 9,392 Total $ 522,044 $ (40,249 ) $ 481,795
Intangible Assets Deemed to Indefinite Life and Not Being Amortized	Intangible assets deemed to have an indefinite life and not being amortized consist of the following: December 31 Aggregates Business Cement Magnesia Specialties Total (add 000) 2016 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,015 9,137 — 19,152 Trade names 280 — 2,565 2,845 Total $ 16,895 $ 9,137 $ 2,565 $ 28,597 2015 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,175 9,137 — 19,312 Trade names 280 — 2,565 2,845 Total $ 17,055 $ 9,137 $ 2,565 $ 28,757
Schedule of Acquired Intangibles	During 2016, the Corporation acquired $15,134,000 of intangibles, consisting of the following: (add 000, except year data) Amount Weighted-average amortization period Subject to amortization: Customer relationships $ 9,950 10.3 years Operating permits 4,984 40.6 years Other 200 1.5 years Total $ 15,134 20.2 years
Estimated Amortization Expense of Intangible Assets	The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows: (add 000) 2017 $ 14,375 2018 13,417 2019 12,107 2020 11,727 2021 11,021 Thereafter 420,068 Total $ 482,715

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Schedule of Accounts Receivable Net	(add 000) 2016 2015 Customer receivables $ 456,508 $ 408,551 Other current receivables 7,668 9,310 464,176 417,861 Less allowances (6,266 ) (6,940 ) Total $ 457,910 $ 410,921

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2016
Inventory Disclosure [Abstract]
Schedule of Inventories Net	December 31 (add 000) 2016 2015 Finished products $ 479,291 $ 433,649 Products in process and raw materials 61,171 55,194 Supplies and expendable parts 116,024 110,882 656,486 599,725 Less allowances (134,862 ) (130,584 ) Total $ 521,624 $ 469,141

Property, Plant and Equipment33

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	December 31 (add 000) 2016 2015 Land and land improvements $ 915,158 $ 865,700 Mineral reserves and interests 1,114,560 1,001,295 Buildings 151,115 144,076 Machinery and equipment 3,766,975 3,473,826 Construction in progress 167,722 128,301 6,115,530 5,613,198 Less accumulated depreciation, depletion and amortization (2,692,135 ) (2,457,198 ) Total $ 3,423,395 $ 3,156,000
Gross Asset Value and Accumulated Amortization for Machinery and Equipment Recorded under Capital Lease	The gross asset value and accumulated amortization for machinery and equipment recorded under capital leases at December 31 were as follows: (add 000) 2016 2015 Machinery and equipment under capital leases $ 23,117 $ 19,379 Less accumulated amortization (8,077 ) (5,102 ) Total $ 15,040 $ 14,277

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	December 31 (add 000) 2016 2015 6.6% Senior Notes, due 2018 $ 299,483 $ 299,113 7% Debentures, due 2025 124,090 124,002 6.25% Senior Notes, due 2037 227,975 227,917 4.25% Senior Notes, due 2024 395,252 394,690 Floating Rate Notes, due 2017, interest rate of 2.10% and 1.71% at December 31, 2016 and 2015, respectively 299,033 298,868 Term Loan Facility, interest rate of 1.86% at December 31, 2015 - 222,521 Revolving Facility, due 2021, interest rate of 1.86% at December 31, 2016 160,000 - Trade Receivable Facility, interest rate of 1.34% at December 31, 2016 180,000 - Other notes 356 1,663 Total 1,686,189 1,568,774 Less current maturities (180,036 ) (18,713 ) Long-term debt $ 1,506,153 $ 1,550,061
Schedule of Principal Amount, Effective Interest Rate and Maturity Date for Corporation's Senior Notes	Principal Amount (add 000) Effective Interest Rate Maturity Date 6.6% Senior Notes $ 300,000 6.81% April 15, 2018 7% Debentures $ 125,000 7.12% December 1, 2025 6.25% Senior Notes $ 230,000 6.45% May 1, 2037 4.25% Senior Notes $ 400,000 4.25% July 2, 2024 Floating Rate Notes $ 300,000 Three-month LIBOR+1.10% June 30, 2017
Schedule of Revolving Facility	Lender (add 000) Revolving Facility Commitment JPMorgan Chase Bank, N.A. $ 92,800 BB&T 92,800 Deutsche Bank AG New York Branch 92,800 SunTrust Bank 92,800 Wells Fargo Bank, N.A. 92,800 PNC Bank, National Association 62,000 Regions Bank 62,000 The Northern Trust Company 62,000 The Bank of Tokyo-Mitsubishi UFJ, Ltd. 30,000 Comerica Bank 20,000 Total $ 700,000
Schedule of Corporation's Long-Term Debt Maturities	The Corporation’s long-term debt maturities for the five years following December 31, 2016, and thereafter are: (add 000) 2017 $ 180,035 2018 299,534 2019 55 2020 60 2021 459,098 Thereafter 747,407 Total $ 1,686,189

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Components of Tax Expense (Benefit) on Income from Continuing Operations	The components of the Corporation’s tax expense (benefit) on income from continuing operations are as follows: years ended December 31 (add 000) 2016 2015 2014 Federal income taxes: Current $ 97,975 $ 20,627 $ 35,313 Deferred 68,899 85,295 46,616 Total federal income taxes 166,874 105,922 81,929 State income taxes: Current 15,189 18,153 10,307 Deferred (1,149 ) 930 3,376 Total state income taxes 14,040 19,083 13,683 Foreign income taxes: Current 1,064 99 1,262 Deferred (394 ) (241 ) (2,027 ) Total foreign income taxes 670 (142 ) (765 ) Total taxes on income $ 181,584 $ 124,863 $ 94,847
Summary of Effective Income Tax Rate on Continuing Operations	The Corporation’s effective income tax rate on continuing operations varied from the statutory United States income tax rate because of the following permanent tax differences: years ended December 31 2016 2015 2014 Statutory tax rate 35.0 % 35.0 % 35.0 % (Reduction) increase resulting from: Effect of statutory depletion (5.4 ) (7.8 ) (9.6 ) State income taxes, net of federal tax benefit 1.5 3.0 3.6 Domestic production deduction (2.0 ) (0.1 ) (0.9 ) Transfer pricing — — (0.2 ) Goodwill write off — 0.4 3.9 Foreign tax rate differential (0.1 ) — 1.3 Disallowed compensation 0.2 0.2 3.7 Transaction costs 0.1 — 2.4 Other items 0.6 (0.5 ) (1.1 ) Effective income tax rate 29.9 % 30.2 % 38.1 %
Components of Deferred Tax Assets and Liabilities	The principal components of the Corporation’s deferred tax assets and liabilities are as follows: December 31 Deferred Assets (Liabilities) (add 000) 2016 2015 Deferred tax assets related to: Employee benefits $ 61,462 $ 56,302 Inventories 71,490 75,907 Valuation and other reserves 38,206 42,857 Net operating loss carryforwards 10,507 11,448 Accumulated other comprehensive loss 82,793 67,757 AMT credit carryforward 2,771 48,197 Gross deferred tax assets 267,229 302,468 Valuation allowance on deferred tax assets (8,521 ) (8,967 ) Total net deferred tax assets 258,708 293,501 Deferred tax liabilities related to: Property, plant and equipment (635,576 ) (593,767 ) Goodwill and other intangibles (268,999 ) (266,436 ) Other items, net (17,152 ) (16,757 ) Total deferred tax liabilities (921,727 ) (876,960 ) Net deferred tax liability $ (663,019 ) $ (583,459 )
Schedule of Unrecognized Tax Benefits Excluding Interest Correlative Effects	The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects: years ended December 31 (add 000) 2016 2015 2014 Unrecognized tax benefits at beginning of year $ 18,727 $ 21,107 $ 11,826 Gross increases – tax positions in prior years 2,401 3,079 2,075 Gross decreases – tax positions in prior years (1,924 ) (3,512 ) (203 ) Gross increases – tax positions in current year 4,650 4,978 3,369 Gross decreases – tax positions in current year (2,047 ) (594 ) (51 ) Lapse of statute of limitations — (6,331 ) (1,872 ) Unrecognized tax benefits assumed with acquisition — — 5,963 Unrecognized tax benefits at end of year $ 21,807 $ 18,727 $ 21,107

Retirement Plans, Postretirem36

Retirement Plans, Postretirement and Postemployment Benefits (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Values of Pension Plan Assets by Asset Class and Fair Value Hierarchy Level	The fair values of pension plan assets by asset class and fair value hierarchy level are as follows: December 31 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value (add 000) 2016 Equity securities: Mid-sized to large cap $ — $ 169,176 $ — $ 169,176 Small cap, international and emerging growth funds — 169,678 — 169,678 Debt securities: Core fixed income — 168,282 — 168,282 Real estate — — 44,890 44,890 Hedge funds — — 44,036 44,036 Cash 145 — — 145 Total $ 145 $ 507,136 $ 88,926 $ 596,207 2015 Equity securities: Mid-sized to large cap $ — $ 156,008 $ — $ 156,008 Small cap, international and emerging growth funds — 144,405 — 144,405 Debt securities: Core fixed income — 167,545 — 167,545 Real estate 15,479 — 23,242 38,721 Hedge funds - — 39,219 39,219 Cash 614 — — 614 Total $ 16,093 $ 467,958 $ 62,461 $ 546,512
Schedule of Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates at December 31 are: 2016 2015 Health care cost trend rate assumed for next year 7.0% 7.0% Rate to which the cost trend rate gradually declines 5.0% 5.0% Year the rate reaches the ultimate rate 2021 2020
Schedule of One Percentage-Point Change in Assumed Health Care Cost Trend Rates	A one percentage-point change in assumed health care cost trend rates would have the following effects: One Percentage Point (add 000) Increase (Decrease) Total service and interest cost components $ 49 $ (42 ) Postretirement benefit obligation $ 1,051 $ (911 )
Pension
Schedule of Components of Net Periodic Benefit Credit Cost	The net periodic retirement benefit cost of defined benefit plans includes the following components: years ended December 31 (add 000) 2016 2015 2014 Components of net periodic benefit cost: Service cost $ 22,167 $ 23,001 $ 17,125 Interest cost 35,879 33,151 28,935 Expected return on assets (37,699 ) (36,385 ) (32,661 ) Amortization of: Prior service cost 350 422 445 Actuarial loss 12,074 17,159 4,045 Transition asset (1 ) (1 ) (1 ) Settlement charge 124 — - Termination benefit charge 764 2,085 13,652 Net periodic benefit cost $ 33,658 $ 39,432 $ 31,540
Schedule of Recognized Comprehensive Earnings	The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2016 2015 2014 Actuarial loss $ 52,028 $ 9,916 $ 105,546 Amortization of: Prior service cost (350 ) (422 ) (445 ) Actuarial loss (12,074 ) (17,159 ) (4,045 ) Transition asset 1 1 1 Special plan termination benefits (764 ) (2,085 ) — Settlement charge (124 ) — - Net prior service cost — 2,338 — Total $ 38,717 $ (7,411 ) $ 101,057
Schedule of Net Periodic Benefit Credit or Cost Not Yet Recognized	Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost: December 31 2016 2015 (add 000) Gross Net of tax Gross Net of tax Prior service cost $ 425 $ 261 $ 1,028 $ 628 Actuarial loss 218,056 133,083 178,770 108,874 Transition asset (7 ) (4 ) (8 ) (5 ) Total $ 218,474 $ 133,340 $ 179,790 $ 109,497
Schedule of Change in Projected Benefit Obligation	The defined benefit plans’ change in projected benefit obligation is as follows: years ended December 31 (add 000) 2016 2015 Change in projected benefit obligation: Net projected benefit obligation at beginning of year $ 754,543 $ 753,975 Service cost 22,167 23,001 Interest cost 35,879 33,151 Actuarial loss (gain) 49,760 (27,119 ) Gross benefits paid (30,500 ) (30,803 ) Nonrecurring termination benefit - 2,338 Net projected benefit obligation at end of year $ 831,849 $ 754,543
Schedule of Change In Plan Assets	The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows: years ended December 31 (add 000) 2016 2015 Change in plan assets: Fair value of plan assets at beginning of year $ 546,512 $ 524,042 Actual return on plan assets, net 35,432 (651 ) Employer contributions 44,763 53,924 Gross benefits paid (30,500 ) (30,803 ) Fair value of plan assets at end of year $ 596,207 $ 546,512
Schedule of Funded Status	December 31 (add 000) 2016 2015 Funded status of the plan at end of year $ (235,642 ) $ (208,031 ) Accrued benefit cost $ (235,642 ) $ (208,031 )
Schedule of Amounts Recognized on Consolidated Balance Sheets	December 31 (add 000) 2016 2015 Amounts recognized on consolidated balance sheets consist of: Current liability $ (6,223 ) $ (6,048 ) Noncurrent liability (229,419 ) (201,983 ) Net amount recognized at end of year $ (235,642 ) $ (208,031 )
Schedule of Accumulated Benefit Obligations in Excess of Plan Assets	Benefit obligations and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets are as follows: December 31 (add 000) 2016 2015 Projected benefit obligation $ 831,849 $ 754,543 Accumulated benefit obligation $ 752,659 $ 688,017 Fair value of plan assets $ 596,207 $ 546,512
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine benefit obligations as of December 31 are: 2016 2015 Discount rate 4.29% 4.67% Rate of increase in future compensation levels 4.50% 4.50% Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 are: 2016 2015 2014 Discount rate 4.67% 4.25% 5.17% Rate of increase in future compensation levels 4.50% 4.50% 5.00% Expected long-term rate of return on assets 7.00% 7.00% 7.00%
Schedule of Target Assets Allocation	The target allocation for 2016 and the actual pension plan asset allocation by asset class are as follows: Percentage of Plan Assets 2016 December 31 Asset Class Target Allocation 2016 2015 Equity securities 54% 57% 55% Debt securities 30% 28% 31% Hedge funds 8% 7% 7% Real estate 8% 8% 7% Total 100% 100% 100%
Change in Fair Value of Pension Plan Assets	The change in the fair value of pension plan assets valued using significant unobservable inputs (Level 3) is as follows: years ended December 31 Real Estate Hedge Funds (add 000) 2016 Balance at beginning of year $ 23,242 $ 39,219 Purchases, sales, settlements, net 18,579 3,100 Actual return on plan assets held at period end 3,069 1,717 Balance at end of year $ 44,890 $ 44,036 2015 Balance at beginning of year $ 20,363 $ 38,264 Actual return on plan assets held at period end 2,879 955 Balance at end of year $ 23,242 $ 39,219
Schedule of Expected Benefit Payments	The expected benefit payments to be paid from plan assets for each of the next five years and the five-year period thereafter are as follows: (add 000) 2017 $ 36,563 2018 $ 38,452 2019 $ 40,792 2020 $ 42,981 2021 $ 44,403 Years 2022 - 2026 $ 250,080
Postretirement Benefits
Schedule of Components of Net Periodic Benefit Credit Cost	The net periodic postretirement benefit credit cost for postretirement plans includes the following components: years ended December 31 (add 000) 2016 2015 2014 Components of net periodic benefit credit: Service cost $ 85 $ 137 $ 206 Interest cost 863 928 1,164 Amortization of: Prior service credit (1,959 ) (2,302 ) (3,255 ) Actuarial gain (499 ) (309 ) (266 ) Settlement credit (9 ) - - Total net periodic benefit credit $ (1,519 ) $ (1,546 ) $ (2,151 )
Schedule of Recognized Comprehensive Earnings	The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2016 2015 2014 Actuarial loss (gain) $ 686 $ (626 ) $ (3,026 ) Net prior service credit (1,326 ) - - Settlement credit 9 - - Amortization of: Prior service credit 1,959 2,302 3,255 Actuarial gain 499 309 266 Total $ 1,827 $ 1,985 $ 495
Schedule of Net Periodic Benefit Credit or Cost Not Yet Recognized	Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit credit or cost: December 31 2016 2015 (add 000) Gross Net of tax Gross Net of tax Prior service credit $ (4,153 ) $ (2,551 ) $ (4,786 ) $ (2,924 ) Actuarial gain (3,857 ) (2,369 ) (5,050 ) (3,086 ) Total $ (8,010 ) $ (4,920 ) $ (9,836 ) $ (6,010 )
Schedule of Change in Projected Benefit Obligation	The postretirement health care plans’ change in benefit obligation is as follows: years ended December 31 (add 000) 2016 2015 Change in benefit obligation: Net benefit obligation at beginning of year $ 23,408 $ 25,086 Service cost 85 137 Interest cost 863 928 Participants’ contributions 2,616 1,777 Actuarial loss (gain) 688 (627 ) Gross benefits paid (5,743 ) (3,893 ) Plan amendments (1,326 ) - Net benefit obligation at end of year $ 20,591 $ 23,408
Schedule of Change In Plan Assets	The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows: years ended December 31 (add 000) 2016 2015 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Employer contributions 3,127 2,116 Participants’ contributions 2,616 1,777 Gross benefits paid (5,743 ) (3,893 ) Fair value of plan assets at end of year $ — $ —
Schedule of Funded Status	December 31 (add 000) 2016 2015 Funded status of the plan at end of year $ (20,591 ) $ (23,408 ) Accrued benefit cost $ (20,591 ) $ (23,408 )
Schedule of Amounts Recognized on Consolidated Balance Sheets	December 31 (add 000) 2016 2015 Amounts recognized on consolidated balance sheets consist of: Current liability $ (3,070 ) $ (2,120 ) Noncurrent liability (17,521 ) (21,288 ) Net amount recognized at end of year $ (20,591 ) $ (23,408 )
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are: 2016 2015 Discount rate 3.78 % 4.25 % Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are: 2016 2015 2014 Discount rate 4.25 % 3.83 % 4.42 %
Schedule of Expected Benefit Payments	The total expected benefit payments to be paid by the Corporation, net of participant contributions, for each of the next five years and the five-year period thereafter are as follows: (add 000) 2017 $ 3,070 2018 $ 2,120 2019 $ 2,000 2020 $ 1,873 2021 $ 1,781 Years 2022 - 2026 $ 6,434

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary Information for Restricted Stock Awards and Incentive Compensation Awards	The following table summarizes information for restricted stock awards and incentive compensation awards as of December 31, 2016: Restricted Stock - Service Based Restricted Stock - Performance Based Incentive Compensation Number of Awards Weighted- Average Grant-Date Fair Value Number of Awards Weighted- Average Grant-Date Fair Value Number of Awards Weighted- Average Grant-Date Fair Value January 1, 2016 288,563 $ 120.92 36,607 $ 117.76 37,340 $ 106.45 Awarded 73,550 $ 128.48 75,421 $ 124.41 18,570 $ 124.41 Distributed (51,849 ) $ 104.82 — $ — (14,665 ) $ 107.01 Forfeited (2,947 ) $ 129.59 (711 ) $ 124.41 (696 ) $ 108.28 December 31, 2016 307,317 $ 125.36 111,317 $ 122.22 40,549 $ 114.44
Summary Information for Stock Options	The following table includes summary information for stock options as of December 31, 2016: Number of Options Weighted- Average Exercise Price Weighted-Average Remaining Contractual Life (years) Outstanding at January 1, 2016 686,012 $ 95.43 Exercised (276,240 ) $ 98.67 Terminated (2,881 ) $ 89.06 Outstanding at December 31, 2016 406,891 $ 93.27 3.9 Exercisable at December 31, 2016 324,979 $ 82.63 3.0
Schedule of Stock-Based Compensation Expense	The following table summarizes stock-based compensation expense for the years ended December 31, 2016, 2015 and 2014, unrecognized compensation cost for nonvested awards at December 31, 2016 and the weighted-average period over which unrecognized compensation cost will be recognized: (add 000, except year data) Stock Options Restricted Stock Incentive Compensation Directors’ Awards Total Stock-based compensation expense recognized for years ended December 31: 2016 $ 1,646 $ 17,747 $ 442 $ 646 $ 20,481 2015 $ 2,679 $ 9,809 $ 376 $ 725 13,589 2014 $ 2,020 $ 6,189 $ 257 $ 527 8,993 Unrecognized compensation cost at December 31, 2016: $ 1,045 $ 19,533 $ 340 $ — $ 20,918 Weighted-average period over which unrecognized compensation cost will be recognized: 1.6 years 2.1 years 1.5 years —
Stock-Based Compensation Expense in Future for Outstanding Awards	The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2016: (add 000) 2017 $ 11,492 2018 7,547 2019 1,879 Total $ 20,918

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Future Minimum Lease and Royalty Commitments for All Noncancelable Agreements	Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2016 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2017 $ 3,416 $ 125,316 2018 3,561 68,488 2019 3,241 59,727 2020 2,558 55,080 2021 1,768 51,376 Thereafter 5,216 355,918 Total 19,760 $ 715,905 Less: imputed interest (4,155 ) Present value of minimum lease payments 15,605 Less: current capital lease obligations (2,683 ) Long-term capital lease obligations $ 12,922
Future Minimum Lease Commitments for Capital Lease Obligations	Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2016 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2017 $ 3,416 $ 125,316 2018 3,561 68,488 2019 3,241 59,727 2020 2,558 55,080 2021 1,768 51,376 Thereafter 5,216 355,918 Total 19,760 $ 715,905 Less: imputed interest (4,155 ) Present value of minimum lease payments 15,605 Less: current capital lease obligations (2,683 ) Long-term capital lease obligations $ 12,922

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Schedule of Changes in Asset Retirement Obligations	The following shows the changes in the asset retirement obligations: years ended December 31: (add 000) 2016 2015 Balance at beginning of year $ 89,604 $ 70,422 Accretion expense 4,288 3,336 Liabilities incurred and liabilities assumed in business combinations 6,700 14,735 Liabilities settled 166 (4,490 ) Revisions in estimated cash flows 348 5,601 Balance at end of year $ 101,106 $ 89,604
Schedule of Contractual Purchase Commitments	The Corporation’s contractual purchase commitments as of December 31, 2016 are as follows: (add 000) 2017 $ 154,804 2018 24,555 2019 16,453 2020 2,979 2021 454 Thereafter 1,136 Total $ 200,381

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Financial Data for Continuing Operation For Corporation's Reportable Business Segments	The following tables display selected financial data for the Corporation’s reportable business segments . Selected Financial Data by Business Segment years ended December 31 (add 000) Total revenues 2016 2015 2014 Mid-America Group $ 1,017,098 $ 926,251 $ 848,855 Southeast Group 321,078 304,472 274,352 West Group 1,970,165 1,675,021 1,356,283 Total Aggregates Business 3,308,341 2,905,744 2,479,490 Cement 375,814 475,725 265,114 Magnesia Specialties 257,058 245,879 256,702 Less: Intersegment revenues (122,464 ) (87,778 ) (43,355 ) Total $ 3,818,749 $ 3,539,570 $ 2,957,951 Net sales Mid-America Group $ 945,123 $ 851,854 $ 770,568 Southeast Group 304,451 285,302 254,986 West Group 1,847,211 1,535,848 1,207,879 Total Aggregates Business 3,096,785 2,673,004 2,233,433 Cement 364,445 455,382 252,911 Magnesia Specialties 238,001 227,508 236,106 Less: Intersegment sales (122,464 ) (87,778 ) (43,355 ) Total $ 3,576,767 $ 3,268,116 $ 2,679,095 Gross profit (loss) Mid-America Group $ 305,794 $ 256,586 $ 216,883 Southeast Group 57,108 34,197 10,653 West Group 344,581 254,946 155,678 Total Aggregates Business 707,483 545,729 383,214 Cement 120,100 103,473 52,469 Magnesia Specialties 89,477 78,732 84,594 Corporate (8,094 ) (6,167 ) 2,083 Total $ 908,966 $ 721,767 $ 522,360 years ended December 31 (add 000) Selling, general and administrative expenses 2016 2015 2014 Mid-America Group $ 53,022 $ 52,606 $ 52,217 Southeast Group 17,325 18,467 17,788 West Group 71,531 66,639 50,147 Total Aggregates Business 141,878 137,712 120,152 Cement 24,798 26,626 12,741 Magnesia Specialties 9,694 9,499 9,776 Corporate 71,635 44,397 26,576 Total $ 248,005 $ 218,234 $ 169,245 Earnings (Loss) from operations Mid-America Group $ 257,347 $ 206,820 $ 172,208 Southeast Group 41,396 16,435 (5,293 ) West Group 277,249 205,699 153,182 Total Aggregates Business 575,992 428,954 320,097 Cement 99,362 47,821 40,751 Magnesia Specialties 79,104 68,886 74,805 Corporate (87,137 ) (66,245 ) (120,780 ) Total $ 667,321 $ 479,416 $ 314,873 Intersegment revenues and intersegment sales represent Cement business sales to the West Group’s ready mixed concrete business. years ended December 31 (add 000) Assets employed 2016 2015 2014 Mid-America Group $ 1,406,526 $ 1,304,574 $ 1,290,833 Southeast Group 594,967 583,369 604,044 West Group 2,981,701 2,621,636 2,444,400 Total Aggregates Business 4,983,194 4,509,579 4,339,277 Cement 1,922,317 1,939,796 2,451,799 Magnesia Specialties 150,969 147,795 150,359 Corporate 244,425 360,441 273,082 Total $ 7,300,905 $ 6,957,611 $ 7,214,517 Depreciation, depletion and amortization Mid-America Group $ 64,295 $ 61,693 $ 63,294 Southeast Group 30,590 31,644 31,955 West Group 119,819 93,947 74,283 Total Aggregates Business 214,704 187,284 169,532 Cement 44,834 53,672 30,620 Magnesia Specialties 12,865 13,769 10,394 Corporate 12,850 8,862 12,200 Total $ 285,253 $ 263,587 $ 222,746 years ended December 31 (add 000) Total property additions 2016 2015 2014 Mid-America Group $ 152,014 $ 77,640 $ 76,753 Southeast Group 30,588 12,155 23,326 West Group 310,162 235,245 753,342 Total Aggregates Business 492,764 325,040 853,421 Cement 28,633 9,599 975,063 Magnesia Specialties 8,944 8,916 2,588 Corporate 10,430 20,561 15,349 Total $ 540,771 $ 364,116 $ 1,846,421 Property additions through acquisitions Mid-America Group $ 1,524 $ 4,385 $ — Southeast Group — — — West Group 132,112 35,965 632,560 Total Aggregates Business 133,636 40,350 632,560 Cement — — 970,300 Magnesia Specialties — — — Corporate — — — Total $ 133,636 $ 40,350 $ 1,602,860
Total Revenues, Net Sales and Gross Profit by Product Line	The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include the asphalt/paving and ready mixed concrete product lines. All aggregates-related downstream product lines reside in the West Group. The following tables, which are reconciled to consolidated amounts, provide total revenues, net sales and gross profit by line of business: Aggregates (further divided by product line), Cement and Magnesia Specialties. Interproduct revenues and interproduct sales represent sales from the aggregates product line to the asphalt/paving and ready mixed concrete product lines.. Intersegment revenues and intersegment sales represent cement product lines sales to the ready mixed concrete product line. years ended December 31 (add 000) Total revenues 2016 2015 2014 Aggregates $ 2,267,574 $ 2,120,245 $ 1,880,074 Asphalt/Paving 345,134 290,966 303,777 Ready Mixed Concrete 903,803 657,831 431,383 Less: Interproduct revenues (208,170 ) (163,298 ) (135,744 ) Total Aggregates Business 3,308,341 2,905,744 2,479,490 Cement 375,814 475,725 265,114 Magnesia Specialties 257,058 245,879 256,702 Less: Intersegment revenues (122,464 ) (87,778 ) (43,355 ) Total $ 3,818,749 $ 3,539,570 $ 2,957,951 Net sales Aggregates $ 2,060,876 $ 1,896,143 $ 1,644,265 Asphalt/Paving 341,444 283,628 294,239 Ready Mixed Concrete 902,635 656,531 430,673 Less: Interproduct sales (208,170 ) (163,298 ) (135,744 ) Total Aggregates Business 3,096,785 2,673,004 2,233,433 Cement 364,445 455,382 252,911 Magnesia Specialties 238,001 227,508 236,106 Less: Intersegment sales (122,464 ) (87,778 ) (43,355 ) Total $ 3,576,767 $ 3,268,116 $ 2,679,095 Gross profit (loss) Aggregates $ 554,801 $ 467,053 $ 324,093 Asphalt/Paving 53,569 35,734 19,992 Ready Mixed Concrete 99,113 42,942 39,129 Total Aggregates Business 707,483 545,729 383,214 Cement 120,100 103,473 52,469 Magnesia Specialties 89,477 78,732 84,594 Corporate (8,094 ) (6,167 ) 2,083 Total $ 908,966 $ 721,767 $ 522,360
Domestic and Foreign Total Revenues	Domestic and foreign total revenues are as follows: years ended December 31 (add 000) 2016 2015 2014 Domestic $ 3,761,651 $ 3,493,462 $ 2,912,115 Foreign 57,098 46,108 45,836 Total $ 3,818,749 $ 3,539,570 $ 2,957,951

Supplemental Cash Flow Inform41

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Components of Change in Other Assets and Liabilities, Net	The components of the change in other assets and liabilities, net, are as follows: years ended December 31 (add 000) 2016 2015 2014 Other current and noncurrent assets $ 9,171 $ (3,631 ) $ 8,066 Accrued salaries, benefits and payroll taxes 13,155 (12,303 ) 10,136 Accrued insurance and other taxes (2,688 ) 4,425 (17,641 ) Accrued income taxes (12,523 ) (4,364 ) 27,680 Accrued pension, postretirement and postemployment benefits (15,955 ) (18,153 ) 1,150 Other current and noncurrent liabilities (6,053 ) (3,014 ) (10,681 ) Change in other assets and liabilities, net $ (14,893 ) $ (37,040 ) $ 18,710
Schedule Of Noncash Investing and Financing Activities	Noncash investing and financing activities are as follows: years ended December 31 (add 000) 2016 2015 2014 Noncash investing and financing activities: Accrued liabilities for purchases of property, plant and equipment $ 38,566 $ 22,285 $ 31,172 Acquisition of assets through capital lease $ 1,399 $ 1,445 $ 7,788 Acquisition of assets through asset exchange $ — $ 5,000 $ 2,091 Seller financing of land purchase $ — $ — $ 1,500 Acquisition of TXI net assets assumed through issuances of common stock and options $ — $ — $ 2,691,986
Supplemental Disclosures of Cash Flow Information	Supplemental disclosures of cash flow information are as follows: years ended December 31 (add 000) 2016 2015 2014 Cash paid for interest $ 73,664 $ 71,011 $ 81,304 Cash paid for income taxes $ 124,342 $ 46,774 $ 15,955

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)FacilityStatePlantshares	Dec. 31, 2015$ / shares	Dec. 31, 2014$ / shares
Significant Accounting Policies [Line Items]
Number of quarries distribution facilities and plants | Facility	400
Number of states with aggregates business sales by destination | State	29
Maximum FDIC, insurance limit to not available of funds in lockboxes	$ 250,000
Company policy for maximum cash maintained at one bank	100,000,000
Minimum at risk receivable balance for specific reserve	$ 50,000
Weighted-average fair value of stock option granted | $ / shares		$ 57.71	$ 43.42
Minimum likelihood for recognition of tax benefit related to uncertain tax position	50.00%
Minimum
Significant Accounting Policies [Line Items]
Warranty term	9 months
Maximum
Significant Accounting Policies [Line Items]
Warranty term	1 year
Stock Options
Significant Accounting Policies [Line Items]
Stock options issued | shares	0
Inventory Finished Goods
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	12 months
Expendable Parts Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	5 years
Supplies Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	1 year
Percentage of Aggregates Business Net Sales in Top Five Sales states | Geographic Concentration Risk | Sales Revenue Segment
Significant Accounting Policies [Line Items]
Total net sales, percentage	73.00%
Texas | Cement
Significant Accounting Policies [Line Items]
Number of cement plants | Plant	2

Estimated Service Lives for Pro

Estimated Service Lives for Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2016
Building | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	5 years
Building | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	20 years
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	2 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	20 years
Land Improvements | Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	5 years
Land Improvements | Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	15 years

Summary of Key Assumptions Used

Summary of Key Assumptions Used in Determining Fair Value of Stock Options Awarded (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	2.20%	2.50%
Dividend yield	1.20%	1.50%
Volatility factor	36.10%	35.30%
Expected term	8 years 6 months	8 years 6 months

Components of Changes in Accumu

Components of Changes in Accumulated Other Comprehensive Loss and Related Cumulative Noncurrent Deferred Tax Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 4,060,177,000	$ 4,352,748,000	$ 1,574,919,000
Other comprehensive loss before reclassifications, net of tax	(32,576,000)	(10,658,000)	(63,350,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	7,511,000	11,195,000	1,305,000
Other comprehensive earnings (loss), net of tax	(25,065,000)	537,000	(62,045,000)
Ending Balance	4,142,590,000	4,060,177,000	4,352,748,000
Cumulative noncurrent deferred tax assets at end of period	82,793,000	67,757,000	70,367,000
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(103,380,000)	(106,688,000)	(44,549,000)
Other comprehensive loss before reclassifications, net of tax	(31,678,000)	(7,116,000)	(62,726,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	6,685,000	10,424,000	587,000
Other comprehensive earnings (loss), net of tax	(24,993,000)	3,308,000	(62,139,000)
Ending Balance	(128,373,000)	(103,380,000)	(106,688,000)
Cumulative noncurrent deferred tax assets at end of period	82,044,000	66,467,000	68,568,000
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(264,000)	3,278,000	3,902,000
Other comprehensive loss before reclassifications, net of tax	(898,000)	(3,542,000)	(624,000)
Other comprehensive earnings (loss), net of tax	(898,000)	(3,542,000)	(624,000)
Ending Balance	(1,162,000)	(264,000)	3,278,000
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,978,000)	(2,749,000)	(3,467,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	826,000	771,000	718,000
Other comprehensive earnings (loss), net of tax	826,000	771,000	718,000
Ending Balance	(1,152,000)	(1,978,000)	(2,749,000)
Cumulative noncurrent deferred tax assets at end of period	749,000	1,290,000	1,799,000
Accumulated Other Comprehensive (Loss) Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(105,622,000)	(106,159,000)	(44,114,000)
Ending Balance	$ (130,687,000)	$ (105,622,000)	$ (106,159,000)

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Additional interest expense	$ 81,677	$ 76,287	$ 66,057
Tax effect	181,584	124,863	94,847
Earnings from Continuing Operations	(7,511)	(11,195)	(1,305)
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	(6,685)	(10,424)	(587)
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	(826)	(771)	(718)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Special plan termination benefits	764	2,085
Settlement charge	115
Prior service credit	(1,609)	(1,880)	(2,810)
Actuarial loss	11,575	16,850	3,779
Tax effect	(4,160)	(6,631)	(382)
Earnings from Continuing Operations	6,685	10,424	587
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Cost of sale; Selling, General & Administrative Expenses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications out of accumulated other comprehensive loss before taxes	10,845	17,055	969
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Additional interest expense	1,367	1,280	1,188
Tax effect	(541)	(509)	(470)
Earnings from Continuing Operations	$ 826	$ 771	$ 718

Basic and Diluted Earnings Per

Basic and Diluted Earnings Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net earnings from continuing operations attributable to Martin Marietta	$ 425,386	$ 288,792	$ 155,638
Less: Distributed and undistributed earnings attributable to unvested awards	1,775	1,252	647
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta	423,611	287,540	154,991
Basic and diluted net loss attributable to common shareholders from discontinued operations			(37)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$ 423,611	$ 287,540	$ 154,954
Basic weighted-average common shares outstanding	63,610	66,770	56,854
Effect of dilutive employee and director awards	251	250	234
Diluted weighted-average common shares outstanding	63,861	67,020	57,088

Changes in Goodwill (Detail)

Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Balance at beginning of period	$ 2,068,235	$ 2,068,799
Acquisitions	91,174	8,464
Adjustments to purchase price allocations		(3,096)
Divestitures	(72)	(5,932)
Balance at end of period	2,159,337	2,068,235
Mid-America Group
Goodwill [Line Items]
Balance at beginning of period	281,403	282,117
Divestitures		(714)
Balance at end of period	281,403	281,403
Southeast Group
Goodwill [Line Items]
Balance at beginning of period	50,346	50,346
Balance at end of period	50,346	50,346
West Group
Goodwill [Line Items]
Balance at beginning of period	871,220	852,436
Acquisitions	91,174	8,464
Adjustments to purchase price allocations		15,538
Divestitures	(72)	(5,218)
Balance at end of period	962,322	871,220
Cement
Goodwill [Line Items]
Balance at beginning of period	865,266	883,900
Adjustments to purchase price allocations		(18,634)
Balance at end of period	$ 865,266	$ 865,266

Intangible Assets Subject to Am

Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 536,870	$ 522,044
Accumulated Amortization	(54,155)	(40,249)
Net Balance	482,715	481,795
Noncompetition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	6,274	6,274
Accumulated Amortization	(6,106)	(6,069)
Net Balance	168	205
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	45,755	35,805
Accumulated Amortization	(13,636)	(10,448)
Net Balance	32,119	25,357
Operating Permits
Finite-Lived Intangible Assets [Line Items]
Gross Amount	455,095	450,419
Accumulated Amortization	(19,493)	(12,294)
Net Balance	435,602	438,125
Use Rights And Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	16,946	16,746
Accumulated Amortization	(9,239)	(8,030)
Net Balance	7,707	8,716
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,800	12,800
Accumulated Amortization	(5,681)	(3,408)
Net Balance	$ 7,119	$ 9,392

Intangible Assets Deemed to Ind

Intangible Assets Deemed to Indefinite Life and Not Being Amortized (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 28,597	$ 28,757
Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	6,600	6,600
Use Rights Not Subject To Amortization
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	19,152	19,312
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2,845	2,845
Aggregates Business
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	16,895	17,055
Aggregates Business | Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	6,600	6,600
Aggregates Business | Use Rights Not Subject To Amortization
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	10,015	10,175
Aggregates Business | Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	280	280
Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	9,137	9,137
Cement | Use Rights Not Subject To Amortization
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	9,137	9,137
Magnesia Specialties
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2,565	2,565
Magnesia Specialties | Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 2,565	$ 2,565

Goodwill and Other Intangible51

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Other intangibles acquired	$ 15,134
Amortization expense of intangible assets	$ 13,922	$ 13,962	$ 9,311

Schedule of Acquired Intangible

Schedule of Acquired Intangibles (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 15,134
Acquired Finite-lived Intangible Assets, Useful Life	20 years 2 months 12 days
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 9,950
Acquired Finite-lived Intangible Assets, Useful Life	10 years 3 months 18 days
Operating Permits
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 4,984
Acquired Finite-lived Intangible Assets, Useful Life	40 years 7 months 6 days
Other
Acquired Finite Lived Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 200
Acquired Finite-lived Intangible Assets, Useful Life	1 year 6 months

Estimated Amortization Expense

Estimated Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
2,017	$ 14,375
2,018	13,417
2,019	12,107
2,020	11,727
2,021	11,021
Thereafter	420,068
Net Balance	$ 482,715	$ 481,795

Business Combinations - Additio

Business Combinations - Additional Information (Detail)	3 Months Ended
	Sep. 30, 2016USD ($)	Mar. 31, 2016T
Colorado | Minimum
Business Combinations [Line Items]
Acquisition of mineral reserves | T		500,000,000
Central Texas | Ratliff
Business Combinations [Line Items]
Ownership interest percentage under equity method, prior to acquisition	40.00%
Gain resulting from remeasure of existing interest to fair value upon closing of transaction | $	$ 5,863,000

Accounts Receivable, Net (Detai

Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Customer receivables	$ 456,508	$ 408,551
Other current receivables	7,668	9,310
Accounts Receivable, gross	464,176	417,861
Less allowances	(6,266)	(6,940)
Total	$ 457,910	$ 410,921

Accounts Receivable, Net - Addi

Accounts Receivable, Net - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Due from unconsolidated affiliates	$ 2,578	$ 3,794

Inventories Net (Detail)

Inventories Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished products	$ 479,291	$ 433,649
Products in process and raw materials	61,171	55,194
Supplies and expendable parts	116,024	110,882
Inventories, Gross	656,486	599,725
Less allowances	(134,862)	(130,584)
Total	$ 521,624	$ 469,141

Property Plant and Equipment Ne

Property Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Land and land improvements	$ 915,158	$ 865,700
Mineral reserves and interests	1,114,560	1,001,295
Buildings	151,115	144,076
Machinery and equipment	3,766,975	3,473,826
Construction in progress	167,722	128,301
Gross property, plant and equipment	6,115,530	5,613,198
Less accumulated depreciation, depletion and amortization	(2,692,135)	(2,457,198)
Total	$ 3,423,395	$ 3,156,000

Gross Asset Value and Accumulat

Gross Asset Value and Accumulated Amortization for Machinery and Equipment Recorded under Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Machinery and equipment under capital leases	$ 23,117	$ 19,379
Less accumulated amortization	(8,077)	(5,102)
Total	$ 15,040	$ 14,277

Property, Plant and Equipment60

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Depreciation, depletion and amortization	$ 268,935	$ 246,874	$ 211,242
Capitalized interest cost	3,543	5,832	$ 8,033
Property, plant and equipment, net	3,423,395	3,156,000
Bahamas And Canada
Property Plant And Equipment [Line Items]
Property, plant and equipment, net	$ 58,332	$ 58,937

Long-Term Debt (Detail)

Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total	$ 1,686,189	$ 1,568,774
Less current maturities	(180,036)	(18,713)
Long-term debt	1,506,153	1,550,061
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Total	299,483	299,113
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total	124,090	124,002
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total	227,975	227,917
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total	395,252	394,690
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Total	299,033	298,868
Term Loan Facility
Debt Instrument [Line Items]
Total		222,521
Revolving Facility Due, 2021
Debt Instrument [Line Items]
Total	160,000
Other Notes
Debt Instrument [Line Items]
Total	356	$ 1,663
Trade Receivable Facility
Debt Instrument [Line Items]
Total	$ 180,000

Long-Term Debt (Parenthetical)

Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity year	2,018
Interest rate on notes	6.60%
Interest rate	6.81%
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity year	2,025
Interest rate on notes	7.00%
Interest rate	7.12%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity year	2,037
Interest rate on notes	6.25%
Interest rate	6.45%
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Maturity year	2,024
Interest rate on notes	4.25%
Interest rate	4.25%
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity year	2,017
Interest rate	2.10%	1.71%
Term Loan Facility
Debt Instrument [Line Items]
Interest rate		1.86%
Revolving Facility Due, 2021
Debt Instrument [Line Items]
Maturity year	2,021
Interest rate on notes	1.86%
Trade Receivable Facility
Debt Instrument [Line Items]
Credit Facility interest rate	1.34%

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	Dec. 05, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 28, 2016	Sep. 27, 2016	Nov. 09, 2013
Debt Instrument [Line Items]
Required offer price to repurchase senior notes if change of control repurchase event and downgrade below investment grade credit rating occurs		101.00%
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation		$ 200,000,000
Outstanding letters of credit		45,428,000
Additional interest expense		1,367,000	$ 1,280,000	$ 1,188,000
Minimum
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation		$ 50,000,000
Including Acquisition Bridge Debt | Maximum
Debt Instrument [Line Items]
Debt covenant		3.50
Excluding Acquisition Bridge Debt | Maximum
Debt Instrument [Line Items]
Debt covenant		3.75
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 700,000,000	$ 700,000,000
Senior unsecured revolving facility, maturity period	5 years
Debt instrument maturity period		Dec. 5, 2021
Outstanding letters of credit		$ 2,507,000	2,507,000
Short-term Line of Credit
Debt Instrument [Line Items]
Credit facility commitment		5,000,000
Outstanding borrowing under credit facility		$ 0	0
Former Credit Agreement | Revolving Facility
Debt Instrument [Line Items]
Outstanding borrowing under credit facility							$ 0
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Interest rate on notes		6.60%
Maturity year		2,018
Senior notes		$ 300,000,000
Maturity date		Apr. 15, 2018
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements		$ 1,400,000
7% Debentures, Due 2025
Debt Instrument [Line Items]
Interest rate on notes		7.00%
Maturity year		2,025
Senior notes		$ 125,000,000
Maturity date		Dec. 1, 2025
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Interest rate on notes		6.25%
Maturity year		2,037
Senior notes		$ 230,000,000
Maturity date		May 1, 2037
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest rate on notes		4.25%
Maturity year		2,024
Senior notes		$ 400,000,000
Maturity date		Jul. 2, 2024
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity year		2,017
Senior notes		$ 300,000,000
Maturity date		Jun. 30, 2017
Floating Rate Notes, Due 2017 | Three-month London Interbank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.10%
Term Loan Facility | Former Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowing under credit facility							$ 210,937,500
Trade Receivable Facility
Debt Instrument [Line Items]
Credit facility commitment					$ 300,000,000	$ 250,000,000
Debt instrument maturity period		Sep. 27, 2017
Credit facility borrowing base		$ 333,302,000,000	$ 282,258,000,000
Trade Receivable Facility | London Interbank Offered Rate(LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		0.725%

Schedule of Principal Amount, E

Schedule of Principal Amount, Effective Interest Rate and Maturity Date for Corporation's Senior Notes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Effective Interest Rate	6.81%
Maturity Date	Apr. 15, 2018
7% Debentures, Due 2025
Debt Instrument [Line Items]
Principal Amount	$ 125,000,000
Effective Interest Rate	7.12%
Maturity Date	Dec. 1, 2025
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Principal Amount	$ 230,000,000
Effective Interest Rate	6.45%
Maturity Date	May 1, 2037
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Principal Amount	$ 400,000,000
Effective Interest Rate	4.25%
Maturity Date	Jul. 2, 2024
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Effective Interest Rate	2.10%	1.71%
Debt Instrument Effective Interest Rate	Three-month LIBOR+1.10%
Maturity Date	Jun. 30, 2017

Schedule of Revolving Facility

Schedule of Revolving Facility (Detail) - Revolving Credit Facility - USD ($)	Dec. 31, 2016	Dec. 05, 2016
Debt Instrument [Line Items]
Credit facility commitment	$ 700,000,000	$ 700,000,000
J P Morgan Chase Bank, N.A.
Debt Instrument [Line Items]
Credit facility commitment	92,800,000
Wells Fargo Bank, N.A.
Debt Instrument [Line Items]
Credit facility commitment	92,800,000
BB&T
Debt Instrument [Line Items]
Credit facility commitment	92,800,000
Sun Trust Bank
Debt Instrument [Line Items]
Credit facility commitment	92,800,000
Deutsche Bank AG New York Branch
Debt Instrument [Line Items]
Credit facility commitment	92,800,000
PNC Bank, National Association
Debt Instrument [Line Items]
Credit facility commitment	62,000,000
Regions Bank
Debt Instrument [Line Items]
Credit facility commitment	62,000,000
The Northern Trust Company
Debt Instrument [Line Items]
Credit facility commitment	62,000,000
Comerica Bank
Debt Instrument [Line Items]
Credit facility commitment	20,000,000
The Bank of Tokyo Mitsubishi UFJ, Ltd.
Debt Instrument [Line Items]
Credit facility commitment	$ 30,000,000

Schedule of Corporation's Long-

Schedule of Corporation's Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2,017	$ 180,035
2,018	299,534
2,019	55
2,020	60
2,021	459,098
Thereafter	747,407
Total	$ 1,686,189	$ 1,568,774

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,686,189	$ 1,568,774
Long-term debt, fair values	$ 1,752,338	$ 1,625,193

Components of Tax Expense (Bene

Components of Tax Expense (Benefit) on Income from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal income taxes:
Current	$ 97,975	$ 20,627	$ 35,313
Deferred	68,899	85,295	46,616
Total federal income taxes	166,874	105,922	81,929
State income taxes:
Current	15,189	18,153	10,307
Deferred	(1,149)	930	3,376
Total state income taxes	14,040	19,083	13,683
Foreign income taxes:
Current	1,064	99	1,262
Deferred	(394)	(241)	(2,027)
Total foreign income taxes	670	(142)	(765)
Total taxes on income	$ 181,584	$ 124,863	$ 94,847

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2017
Income Taxes [Line Items]
Income tax benefit from NOL carry forwards utilized	$ 11,852,000	$ 156,554,000	$ 16,940,000
Income tax benefits attributable to stock-based compensation	6,792,000	871,000	2,508,000
Foreign pretax earnings (loss)	$ 3,865,000	(1,175,000)	(10,557,000)
Tax deduction, percentage	9.00%
Increased net earnings	$ 13,583,000	$ 222,000	$ 3,239,000
Increased net earnings, per share	$ 0.21	$ 0.01	$ 0.05
Operating loss carryforwards, expiration dates	2,036
Deferred tax assets recognized	$ 10,507,000	$ 11,448,000
Deferred tax asset, valuation allowance	8,303,000	8,690,000
AMT credit carryforward	17,192,000
Deferred tax asset carryforward, net of unrecognized tax benefits	2,771,000	48,197,000
Unrecognized tax benefits that would impact effective tax rate	$ 11,603,000	$ 7,975,000	$ 9,362,000
Expiration date of statute of limitations		2,010	2,011
Tax refund, Per share		$ 0.04	$ 0.01
Tax refund		$ 2,364,000	$ 687,000
Scenario Forecast
Income Taxes [Line Items]
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years				$ 3,935,000
Earliest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations	2,012
Open tax years	2,010
Latest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations	2,013
Open tax years	2,016
Canadian Subsidiary
Income Taxes [Line Items]
Undistributed net earnings	$ 35,392,000
Unrecognized deferred tax liability	1,872,000
Federal Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	0	33,863,000
Domestic Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	220,532,000	273,251,000
Deferred tax asset, valuation allowance		3,714,000
Domestic and foreign tax credits, amount	$ 1,441,000	3,179,000
Domestic tax credits, expiration year	2,018
Deferred tax assets recognized	$ 937,000	2,509,000
Deferred tax asset, valuation allowance	218,000	277,000
State Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	$ 220,532,000	$ 239,388,000

Summary of Effective Income Tax

Summary of Effective Income Tax Rate on Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
Effect of statutory depletion	(5.40%)	(7.80%)	(9.60%)
State income taxes, net of federal tax benefit	1.50%	3.00%	3.60%
Domestic production deduction	(2.00%)	(0.10%)	(0.90%)
Transfer pricing			(0.20%)
Goodwill write off		0.40%	3.90%
Foreign tax rate differential	(0.10%)		1.30%
Disallowed compensation	0.20%	0.20%	3.70%
Transaction costs	0.10%		2.40%
Other items	0.60%	(0.50%)	(1.10%)
Effective income tax rate	29.90%	30.20%	38.10%

Components of Deferred Tax Asse

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets related to:
Employee benefits	$ 61,462	$ 56,302
Inventories	71,490	75,907
Valuation and other reserves	38,206	42,857
Net operating loss carryforwards	10,507	11,448
Accumulated other comprehensive loss	82,793	67,757	$ 70,367
AMT credit carryforward	2,771	48,197
Gross deferred tax assets	267,229	302,468
Valuation allowance on deferred tax assets	(8,521)	(8,967)
Total net deferred tax assets	258,708	293,501
Deferred tax liabilities related to:
Property, plant and equipment	(635,576)	(593,767)
Goodwill and other intangibles	(268,999)	(266,436)
Other items, net	(17,152)	(16,757)
Total deferred tax liabilities	(921,727)	(876,960)
Net deferred tax liability	$ (663,019)	$ (583,459)

Schedule of Unrecognized Tax Be

Schedule of Unrecognized Tax Benefits Excluding Interest Correlative Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 18,727	$ 21,107	$ 11,826
Gross increases – tax positions in prior years	2,401	3,079	2,075
Gross decreases – tax positions in prior years	(1,924)	(3,512)	(203)
Gross increases – tax positions in current year	4,650	4,978	3,369
Gross decreases – tax positions in current year	(2,047)	(594)	(51)
Lapse of statute of limitations		(6,331)	(1,872)
Unrecognized tax benefits assumed with acquisition			5,963
Unrecognized tax benefits at end of year	$ 21,807	$ 18,727	$ 21,107

Schedule of Components of Net P

Schedule of Components of Net Periodic Benefit Credit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 22,167	$ 23,001	$ 17,125
Interest cost	35,879	33,151	28,935
Expected return on assets	(37,699)	(36,385)	(32,661)
Prior service cost (credit)	350	422	445
Actuarial (gain) loss	12,074	17,159	4,045
Transition asset	(1)	(1)	(1)
Settlement charge (credit)	124
Termination benefit charge	764	2,085	13,652
Total net periodic benefit cost (credit)	33,658	39,432	31,540
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	85	137	206
Interest cost	863	928	1,164
Prior service cost (credit)	(1,959)	(2,302)	(3,255)
Actuarial (gain) loss	(499)	(309)	(266)
Settlement charge (credit)	(9)
Total net periodic benefit cost (credit)	$ (1,519)	$ (1,546)	$ (2,151)

Net Periodic Benefit Cost Recog

Net Periodic Benefit Cost Recognized in Comprehensive Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	$ 52,028	$ 9,916	$ 105,546
Prior service (cost) credit	(350)	(422)	(445)
Actuarial gain (loss)	(12,074)	(17,159)	(4,045)
Transition asset	1	1	1
Special plan termination benefits	(764)	(2,085)	(13,652)
Settlement (charge) credit	(124)
Net prior service cost (credit)		2,338
Total	38,717	(7,411)	101,057
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	686	(626)	(3,026)
Prior service (cost) credit	1,959	2,302	3,255
Actuarial gain (loss)	499	309	266
Settlement (charge) credit	9
Net prior service cost (credit)	(1,326)
Total	$ 1,827	$ 1,985	$ 495

Net Periodic Benefit Credit or

Net Periodic Benefit Credit or Cost Not Yet Recognized (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit) - Gross	$ 425	$ 1,028
Actuarial (gain) loss - Gross	218,056	178,770
Transition asset - Gross	(7)	(8)
Total - Gross	218,474	179,790
Prior service cost (credit) - Net of tax	261	628
Actuarial (gain) loss - Net of tax	133,083	108,874
Transition asset - Net of tax	(4)	(5)
Total - Net of tax	133,340	109,497
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit) - Gross	(4,153)	(4,786)
Actuarial (gain) loss - Gross	(3,857)	(5,050)
Total - Gross	(8,010)	(9,836)
Prior service cost (credit) - Net of tax	(2,551)	(2,924)
Actuarial (gain) loss - Net of tax	(2,369)	(3,086)
Total - Net of tax	$ (4,920)	$ (6,010)

Retirement Plans Postretirement

Retirement Plans Postretirement and Postemployment Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans	$ 752,659,000	$ 688,017,000
Combined pension and SERP contributions	44,763,000	53,924,000
Corporation's matching obligations	13,235,000	12,444,000	$ 8,602,000
Accrued postemployment benefits	$ 1,146,000	1,267,000
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of pension asset equity securities in mid and large capitalization funds	50.00%
Pension
Defined Benefit Plan Disclosure [Line Items]
Prior service cost, recognized in net periodic benefit cost	$ 311,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	120,000
Actuarial gain (loss), recognized in net periodic benefit cost	14,098,000
Actuarial gain (loss), recognized in net periodic benefit cost - deferred tax asset and liability	5,438,000
Transition assets, recognized in net periodic benefit cost	1,000
Combined pension and SERP contributions	44,763,000	53,924,000
SERP Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	32,537,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost, recognized in net periodic benefit cost	1,741,000
Actuarial gain (loss), recognized in net periodic benefit cost	284,000
Combined pension and SERP contributions	3,127,000	$ 2,116,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	672,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	110,000
Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	$ 3,070,000

Change in Projected Benefit Obl

Change in Projected Benefit Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligation at beginning of year	$ 754,543	$ 753,975
Service cost	22,167	23,001	$ 17,125
Interest cost	35,879	33,151	28,935
Actuarial loss (gain)	49,760	(27,119)
Gross benefits paid	(30,500)	(30,803)
Nonrecurring termination benefit		2,338
Net projected benefit obligation at end of year	831,849	754,543	753,975
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligation at beginning of year	23,408	25,086
Service cost	85	137	206
Interest cost	863	928	1,164
Participants' contributions	2,616	1,777
Actuarial loss (gain)	688	(627)
Gross benefits paid	(5,743)	(3,893)
Plan amendments	(1,326)
Net projected benefit obligation at end of year	$ 20,591	$ 23,408	$ 25,086

Schedule of Change In Plan Asse

Schedule of Change In Plan Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 546,512,000
Employer contributions	44,763,000	$ 53,924,000
Balance at end of year	596,207,000	546,512,000
Pension
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	546,512,000	524,042,000
Actual return on plan assets, net	35,432,000	(651,000)
Employer contributions	44,763,000	53,924,000
Gross benefits paid	(30,500,000)	(30,803,000)
Balance at end of year	596,207,000	546,512,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	3,127,000	2,116,000
Participants' contributions	2,616,000	1,777,000
Gross benefits paid	$ (5,743,000)	$ (3,893,000)

Schedule of Funded Status (Deta

Schedule of Funded Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	$ (235,642)	$ (208,031)
Accrued benefit cost	(235,642)	(208,031)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	(20,591)	(23,408)
Accrued benefit cost	$ (20,591)	$ (23,408)

Schedule of Amounts Recognized

Schedule of Amounts Recognized on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Current pension and postretirement benefits	$ (6,223)	$ (6,048)
Noncurrent pension, postretirement and postemployment benefits	(229,419)	(201,983)
Net amount recognized at end of year	(235,642)	(208,031)
Current pension and postretirement benefits	(3,070)	(2,120)
Noncurrent pension, postretirement and postemployment benefits	(17,521)	(21,288)
Net amount recognized at end of year	$ (20,591)	$ (23,408)

Schedule of Accumulated Benefit

Schedule of Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - Pension - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 831,849	$ 754,543
Accumulated benefit obligation	752,659	688,017
Fair value of plan assets	$ 596,207	$ 546,512

Schedule of Weighted-Average As

Schedule of Weighted-Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.29%	4.67%
Rate of increase in future compensation levels	4.50%	4.50%
Discount rate	4.67%	4.25%	5.17%
Rate of increase in future compensation levels	4.50%	4.50%	5.00%
Expected long-term rate of return on assets	7.00%	7.00%	7.00%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.78%	4.25%
Discount rate	4.25%	3.83%	4.42%

Schedule of Target Assets Alloc

Schedule of Target Assets Allocation (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	100.00%
Total	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	54.00%
Total	57.00%	55.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	30.00%
Total	28.00%	31.00%
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	8.00%
Total	7.00%	7.00%
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	8.00%
Total	8.00%	7.00%

Schedule of Fair Values of Pens

Schedule of Fair Values of Pension Plan Assets by Asset Class and Fair Value Hierarchy Level (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 596,207	$ 546,512
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	44,890	38,721
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	44,036	39,219
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	145	614
Quoted Prices In Active Markets For Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	145	16,093
Quoted Prices In Active Markets For Identical Assets (Level 1) | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets		15,479
Quoted Prices In Active Markets For Identical Assets (Level 1) | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	145	614
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	507,136	467,958
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	88,926	62,461
Significant Unobservable Inputs (Level 3) | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	44,890	23,242
Significant Unobservable Inputs (Level 3) | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	44,036	39,219
Mid Sized To Large Cap | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	169,176	156,008
Mid Sized To Large Cap | Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	169,176	156,008
International And Emerging Growth Funds | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	169,678	144,405
International And Emerging Growth Funds | Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	169,678	144,405
Core Fixed Income | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	168,282	167,545
Core Fixed Income | Significant Observable Inputs (Level 2) | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 168,282	$ 167,545

Schedule of Change In Fair Valu

Schedule of Change In Fair Value Of Pension Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 23,242	$ 20,363
Purchases, sales, settlements, net	18,579
Actual return on plan assets held at period end	3,069	2,879
Balance at end of year	44,890	23,242
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	39,219	38,264
Purchases, sales, settlements, net	3,100
Actual return on plan assets held at period end	1,717	955
Balance at end of year	$ 44,036	$ 39,219

Schedule of Expected Benefit Pa

Schedule of Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Pension
Defined Benefit Plan Disclosure [Line Items]
2,017	$ 36,563
2,018	38,452
2,019	40,792
2,020	42,981
2,021	44,403
Years 2022 - 2026	250,080
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2,017	3,070
2,018	2,120
2,019	2,000
2,020	1,873
2,021	1,781
Years 2022 - 2026	$ 6,434

Schedule of Assumed Health Care

Schedule of Assumed Health Care Cost Trend Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Health care cost trend rate assumed for next year	7.00%	7.00%
Rate to which the cost trend rate gradually declines	5.00%	5.00%
Year the rate reaches the ultimate rate	2,021	2,020

Schedule of One Percentage-Poin

Schedule of One Percentage-Point Change In Assumed Health Care Cost Trend Rate (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Compensation And Retirement Disclosure [Abstract]
Total service and interest cost components, Increase	$ 49
Postretirement benefit obligation, Increase	1,051
Total service and interest cost components, Decrease	(42)
Postretirement benefit obligation, Decrease	$ (911)

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of incentive compensation to acquire shares, maximum	50.00%
Percentage of discount rate to market value on the incentive compensation	20.00%
Company normal retirement age	62 years
Common stock price	$ 221.53
Non-qualified stock options received by nonemployee board of directors	3,000
Weighted-average grant-date exercise price of options granted		$ 154.58	$ 121
Aggregate intrinsic values of options exercised	$ 22,571	$ 7,318	$ 9,709
Aggregate intrinsic values for options outstanding	52,189
Aggregate intrinsic values for options exercisable	$ 45,138
Awards available for grant	941,000
Additional shares registration under the plan	800,000
Common stock reserved for future issuance	250,000
Common stock issued under the plan	42,025
Recognized tax benefit related to stock-based compensation expense	$ 7,901	$ 5,286	$ 3,542
Texas Industries Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued to former option holders	821,282
Number of options issued per single option	0.7
Employee stock options expiration period	90 days
Options granted in 2015 and 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Options granted prior to 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	8 years
Options granted prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 124.41	$ 108.53	$ 109.17
Aggregate intrinsic values for stock awards	$ 5,270
Common stock price	$ 221.53
Aggregate intrinsic values of stock awards, distributed	$ 1,941	$ 983	$ 584
Restricted Stock - Service Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 128.48	$ 154.26	$ 126.88
Restricted Stock - Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 124.41	$ 108.53	$ 129.14
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic values for stock awards	$ 92,740
Aggregate intrinsic values of stock awards, distributed	$ 9,738	$ 11,387	$ 3,555
Legacy TXI plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards available for grant	0
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	300,000
Common stock issued under the plan	3,699	4,035	3,804

Summary Information for Restric

Summary Information for Restricted Stock Awards and Incentive Compensation Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock - Service Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, January 1, 2016	288,563
Number of Awards, Awarded	73,550
Number of Awards, Distributed	(51,849)
Number of Awards, Forfeited	(2,947)
Number of Awards, December 31, 2016	307,317	288,563
Weighted-Average Grant-Date Fair Value, January 1, 2016	$ 120.92
Weighted-Average Grant-Date Fair Value, Awarded	128.48	$ 154.26	$ 126.88
Weighted-Average Grant-Date Fair Value, Distributed	104.82
Weighted-Average Grant-Date Fair Value, Forfeited	129.59
Weighted-Average Grant-Date Fair Value, December 31, 2016	$ 125.36	$ 120.92
Restricted Stock - Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, January 1, 2016	36,607
Number of Awards, Awarded	75,421
Number of Awards, Forfeited	(711)
Number of Awards, December 31, 2016	111,317	36,607
Weighted-Average Grant-Date Fair Value, January 1, 2016	$ 117.76
Weighted-Average Grant-Date Fair Value, Awarded	124.41	$ 108.53	129.14
Weighted-Average Grant-Date Fair Value, Forfeited	124.41
Weighted-Average Grant-Date Fair Value, December 31, 2016	$ 122.22	$ 117.76
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, January 1, 2016	37,340
Number of Awards, Awarded	18,570
Number of Awards, Distributed	(14,665)
Number of Awards, Forfeited	(696)
Number of Awards, December 31, 2016	40,549	37,340
Weighted-Average Grant-Date Fair Value, January 1, 2016	$ 106.45
Weighted-Average Grant-Date Fair Value, Awarded	124.41	$ 108.53	$ 109.17
Weighted-Average Grant-Date Fair Value, Distributed	107.01
Weighted-Average Grant-Date Fair Value, Forfeited	108.28
Weighted-Average Grant-Date Fair Value, December 31, 2016	$ 114.44	$ 106.45

Summary Information for Stock O

Summary Information for Stock Options (Detail)	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding at January 1, 2016 | shares	686,012
Number of Options, Exercised | shares	(276,240)
Number of Options, Terminated | shares	(2,881)
Number of Options, Outstanding at December 31, 2016 | shares	406,891
Number of Options, Exercisable at December 31, 2016 | shares	324,979
Weighted-Average Exercise Price, Outstanding at January 1, 2016 | $ / shares	$ 95.43
Weighted-Average Exercise Price, Exercised | $ / shares	98.67
Weighted-Average Exercise Price, Terminated | $ / shares	89.06
Weighted-Average Exercise Price, Outstanding at December 31, 2016 | $ / shares	93.27
Weighted-Average Exercise Price, Exercisable at December 31, 2016 | $ / shares	$ 82.63
Weighted-Average Remaining Contractual Life (years), Outstanding at December 31, 2016	3 years 10 months 24 days
Weighted-Average Remaining Contractual Life (years), Exercisable at December 31, 2016	3 years

Schedule of Stock-Based Compens

Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 20,481	$ 13,589	$ 8,993
Unrecognized compensation cost	20,918
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	1,646	2,679	2,020
Unrecognized compensation cost	$ 1,045
Weighted-average period over which unrecognized compensation cost will be recognized:	1 year 7 months 6 days
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 17,747	9,809	6,189
Unrecognized compensation cost	$ 19,533
Weighted-average period over which unrecognized compensation cost will be recognized:	2 years 1 month 6 days
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 442	376	257
Unrecognized compensation cost	$ 340
Weighted-average period over which unrecognized compensation cost will be recognized:	1 year 6 months
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 646	$ 725	$ 527

Stock-Based Compensation Expens

Stock-Based Compensation Expense in Future for Outstanding Awards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
2,017	$ 11,492
2,018	7,547
2,019	1,879
Total	$ 20,918

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Leases [Abstract]
Lease expenses for operating lease	$ 85,945	$ 80,417	$ 59,590
Total royalties	55,257	$ 53,658	$ 50,535
Future minimum lease commitments related to contracts of affreightment	$ 225,900

Future Minimum Lease and Royalt

Future Minimum Lease and Royalty Commitments for All Noncancelable Agreements and Capital Lease Obligations (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Capital Leases
2,017	$ 3,416
2,018	3,561
2,019	3,241
2,020	2,558
2,021	1,768
Thereafter	5,216
Total	19,760
Less: imputed interest	(4,155)
Present value of minimum lease payments	15,605
Less: current capital lease obligations	(2,683)
Long-term capital lease obligations	12,922
Operating Leases & Royalty Commitments
2,017	125,316
2,018	68,488
2,019	59,727
2,020	55,080
2,021	51,376
Thereafter	355,918
Total	$ 715,905

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock reserved for issuance under stock-based plans	2,164,000
Stock Repurchased During Period, Shares	1,587,987	3,285,380	0
Common stock remaining under repurchase authorization	15,126,633
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Percentage ownership by person or group making rights exercisable	15.00%
Rights exercisable price, per share	$ 315
Class B Preferred Stock
Class of Stock [Line Items]
Preferred stock reserved for issuance under stock-based plans	200,000
Maximum
Class of Stock [Line Items]
Stock repurchase program, shares authorized to be repurchased	20,000,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)Bond	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Commitments and Contingencies [Line Items]
Asset retirement obligation depreciation and accretion	$ 8,823,000	$ 6,767,000	$ 4,584,000
Liability reserve for insurance claims	42,184,000	45,911,000
Outstanding letters of credit	45,428,000
Surety bonds	381,456,000
Balance of top 5 surety bonds	$ 85,111,000
Group of bonds, amount | Bond	5
Percentage of top 5 surety bonds	22.00%
Guarantee of affiliate's obligations	$ 25,000,000
Due from affiliate	22,600,000
Purchase commitments for property, plant and equipment	200,381,000
Capital expenditures	$ 62,927,000	116,681,000	$ 34,135,000
Percentage of employees represented in labor union	11.00%
Woodville
Commitments and Contingencies [Line Items]
Collective bargaining agreement expiration month year	2018-05
Magnesia Specialties
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Collective bargaining agreement expiration month year	2019-08
Capital Addition Purchase Commitments
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 94,074,000
Energy And Service Contracts
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 106,307,000
Revolving Line Of Credit Expires In August 2015
Commitments and Contingencies [Line Items]
Line of credit maturity period	2018-02
Interest-Only Note Due December 31, 2019
Commitments and Contingencies [Line Items]
Due from affiliate	$ 6,000,000
Revolving Credit Facility
Commitments and Contingencies [Line Items]
Outstanding letters of credit	$ 2,507,000	$ 2,507,000

Changes in Asset Retirement Obl

Changes in Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 89,604	$ 70,422
Accretion expense	4,288	3,336
Liabilities incurred and liabilities assumed in business combinations	6,700	14,735
Liabilities settled	166	(4,490)
Revisions in estimated cash flows	348	5,601
Balance at end of year	$ 101,106	$ 89,604

Contractual Purchase Commitment

Contractual Purchase Commitments (Detail) $ in Thousands	Dec. 31, 2016USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,017	$ 154,804
2,018	24,555
2,019	16,453
2,020	2,979
2,021	454
Thereafter	1,136
Total	$ 200,381

Business Segments - Additional

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016Segment
Segment Reporting [Abstract]
Reportable business segments	3

Financial Data for Continuing O

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 3,818,749	$ 3,539,570	$ 2,957,951
Net sales	3,576,767	3,268,116	2,679,095
Gross profit (loss)	908,966	721,767	522,360
Selling, general and administrative expenses	248,005	218,234	169,245
Earnings (Loss) from operations	667,321	479,416	314,873
Assets employed	7,300,905	6,957,611	7,214,517
Depreciation, depletion and amortization	285,253	263,587	222,746
Total property additions	540,771	364,116	1,846,421
Property additions through acquisitions	133,636	40,350	1,602,860
Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	3,308,341	2,905,744	2,479,490
Net sales	3,096,785	2,673,004	2,233,433
Gross profit (loss)	707,483	545,729	383,214
Selling, general and administrative expenses	141,878	137,712	120,152
Earnings (Loss) from operations	575,992	428,954	320,097
Assets employed	4,983,194	4,509,579	4,339,277
Depreciation, depletion and amortization	214,704	187,284	169,532
Total property additions	492,764	325,040	853,421
Property additions through acquisitions	133,636	40,350	632,560
Operating Segments | Mid-America Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	1,017,098	926,251	848,855
Net sales	945,123	851,854	770,568
Gross profit (loss)	305,794	256,586	216,883
Selling, general and administrative expenses	53,022	52,606	52,217
Earnings (Loss) from operations	257,347	206,820	172,208
Assets employed	1,406,526	1,304,574	1,290,833
Depreciation, depletion and amortization	64,295	61,693	63,294
Total property additions	152,014	77,640	76,753
Property additions through acquisitions	1,524	4,385
Operating Segments | Southeast Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	321,078	304,472	274,352
Net sales	304,451	285,302	254,986
Gross profit (loss)	57,108	34,197	10,653
Selling, general and administrative expenses	17,325	18,467	17,788
Earnings (Loss) from operations	41,396	16,435	(5,293)
Assets employed	594,967	583,369	604,044
Depreciation, depletion and amortization	30,590	31,644	31,955
Total property additions	30,588	12,155	23,326
Operating Segments | West Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	1,970,165	1,675,021	1,356,283
Net sales	1,847,211	1,535,848	1,207,879
Gross profit (loss)	344,581	254,946	155,678
Selling, general and administrative expenses	71,531	66,639	50,147
Earnings (Loss) from operations	277,249	205,699	153,182
Assets employed	2,981,701	2,621,636	2,444,400
Depreciation, depletion and amortization	119,819	93,947	74,283
Total property additions	310,162	235,245	753,342
Property additions through acquisitions	132,112	35,965	632,560
Operating Segments | Cement
Segment Reporting Information [Line Items]
Total revenues	375,814	475,725	265,114
Net sales	364,445	455,382	252,911
Gross profit (loss)	120,100	103,473	52,469
Selling, general and administrative expenses	24,798	26,626	12,741
Earnings (Loss) from operations	99,362	47,821	40,751
Assets employed	1,922,317	1,939,796	2,451,799
Depreciation, depletion and amortization	44,834	53,672	30,620
Total property additions	28,633	9,599	975,063
Property additions through acquisitions			970,300
Operating Segments | Magnesia Specialties
Segment Reporting Information [Line Items]
Total revenues	257,058	245,879	256,702
Net sales	238,001	227,508	236,106
Gross profit (loss)	89,477	78,732	84,594
Selling, general and administrative expenses	9,694	9,499	9,776
Earnings (Loss) from operations	79,104	68,886	74,805
Assets employed	150,969	147,795	150,359
Depreciation, depletion and amortization	12,865	13,769	10,394
Total property additions	8,944	8,916	2,588
Intersegment revenues/ sales
Segment Reporting Information [Line Items]
Total revenues	(122,464)	(87,778)	(43,355)
Net sales	(122,464)	(87,778)	(43,355)
Corporate
Segment Reporting Information [Line Items]
Gross profit (loss)	(8,094)	(6,167)	2,083
Selling, general and administrative expenses	71,635	44,397	26,576
Earnings (Loss) from operations	(87,137)	(66,245)	(120,780)
Assets employed	244,425	360,441	273,082
Depreciation, depletion and amortization	12,850	8,862	12,200
Total property additions	$ 10,430	$ 20,561	$ 15,349

Total Revenues, Net Sales and G

Total Revenues, Net Sales and Gross Profit by Product Line (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Product Information [Line Items]
Total revenues	$ 3,818,749	$ 3,539,570	$ 2,957,951
Net sales	3,576,767	3,268,116	2,679,095
Gross profit (loss)	908,966	721,767	522,360
Intersegment revenues/ sales
Product Information [Line Items]
Total revenues	(122,464)	(87,778)	(43,355)
Net sales	(122,464)	(87,778)	(43,355)
Corporate
Product Information [Line Items]
Gross profit (loss)	(8,094)	(6,167)	2,083
Aggregates Business | Operating Segments
Product Information [Line Items]
Total revenues	3,308,341	2,905,744	2,479,490
Net sales	3,096,785	2,673,004	2,233,433
Gross profit (loss)	707,483	545,729	383,214
Aggregates Business | Operating Segments | Interproduct revenues/ sales
Product Information [Line Items]
Total revenues	(208,170)	(163,298)	(135,744)
Net sales	(208,170)	(163,298)	(135,744)
Cement | Operating Segments
Product Information [Line Items]
Total revenues	375,814	475,725	265,114
Net sales	364,445	455,382	252,911
Gross profit (loss)	120,100	103,473	52,469
Magnesia Specialties | Operating Segments
Product Information [Line Items]
Total revenues	257,058	245,879	256,702
Net sales	238,001	227,508	236,106
Gross profit (loss)	89,477	78,732	84,594
Aggregates | Aggregates Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total revenues	2,267,574	2,120,245	1,880,074
Net sales	2,060,876	1,896,143	1,644,265
Gross profit (loss)	554,801	467,053	324,093
Asphalt/Paving | Aggregates Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total revenues	345,134	290,966	303,777
Net sales	341,444	283,628	294,239
Gross profit (loss)	53,569	35,734	19,992
Ready Mixed Concrete | Aggregates Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Total revenues	903,803	657,831	431,383
Net sales	902,635	656,531	430,673
Gross profit (loss)	$ 99,113	$ 42,942	$ 39,129

Domestic and Foreign Total Reve

Domestic and Foreign Total Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 3,818,749	$ 3,539,570	$ 2,957,951
Domestic
Segment Reporting Information [Line Items]
Total revenues	3,761,651	3,493,462	2,912,115
Foreign
Segment Reporting Information [Line Items]
Total revenues	$ 57,098	$ 46,108	$ 45,836

Components of Change in Other A

Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ 9,171	$ (3,631)	$ 8,066
Accrued salaries, benefits and payroll taxes	13,155	(12,303)	10,136
Accrued insurance and other taxes	(2,688)	4,425	(17,641)
Accrued income taxes	(12,523)	(4,364)	27,680
Accrued pension, postretirement and postemployment benefits	(15,955)	(18,153)	1,150
Other current and noncurrent liabilities	(6,053)	(3,014)	(10,681)
Change in other assets and liabilities, net	$ (14,893)	$ (37,040)	$ 18,710

Supplemental Cash Flow Infor105

Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Payment of accrual severance	$ 9,682	$ 11,444
Higher pension plan funding	$ 28,270

Schedule Of Noncash Investing a

Schedule Of Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Accrued liabilities for purchases of property, plant and equipment	$ 38,566	$ 22,285	$ 31,172
Acquisition of assets through capital lease	$ 1,399	1,445	7,788
Acquisition of assets through asset exchange		$ 5,000	2,091
Seller financing of land purchase			1,500
Acquisition of TXI net assets assumed through issuances of common stock and options			$ 2,691,986

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 73,664	$ 71,011	$ 81,304
Cash paid for income taxes	$ 124,342	$ 46,774	$ 15,955

Schedule II - Valuation and 108

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 6,940	$ 4,077		$ 4,081
Charged to costs and expenses			2,863
Deductions-describe		674			4	[1]
Balance at end of period		6,266	6,940		4,077
Allowance for uncollectible notes receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		585	1,486		809
Charged to costs and expenses					0
Charged to other accounts-describe	[2]				1,103
Deductions-describe	[1]	148	901		426
Balance at end of period		437	585		1,486
Inventory valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		130,584	119,189		99,026
Charged to costs and expenses		4,160	13,365		11,762
Charged to other accounts-describe	[3]	118	1,400		9,942
Deductions-describe		0	3,370	[4]	1,541	[4]
Balance at end of period		$ 134,862	$ 130,584		$ 119,189
[1]	Write off of uncollectible accounts and change in estimates.
[2]	Application of reserves to acquired notes receivable.
[3]	Application of reserve policy to acquired inventories.
[4]	Divestitures.