Martin Marietta Materials (MLM) 10-K 23 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 12, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
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		64,331,436
Entity Public Float			$ 7,537,227,743

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net Sales	$ 3,268,116	$ 2,679,095	$ 1,943,218
Freight and delivery revenues	271,454	278,856	212,333
Total revenues	3,539,570	2,957,951	2,155,551
Cost of sales	2,546,349	2,156,735	1,579,261
Freight and delivery costs	271,454	278,856	212,333
Total cost of revenues	2,817,803	2,435,591	1,791,594
Gross Profit	721,767	522,360	363,957
Selling, general and administrative expenses	218,234	169,245	150,091
Acquisition-related expenses, net	8,464	42,891	671
Other operating expenses and (income), net	15,653	(4,649)	(4,793)
Earnings from Operations	479,416	314,873	217,988
Interest expense	76,287	66,057	53,467
Other nonoperating (income) and expenses, net	(10,672)	(362)	295
Earnings from continuing operations before taxes on income	413,801	249,178	164,226
Taxes on income	124,863	94,847	44,045
Earnings from Continuing Operations	288,938	154,331	120,181
Loss on discontinued operations, net of related tax benefit of $0, $40 and $417, respectively		(37)	(749)
Consolidated net earnings	288,938	154,294	119,432
Less: Net earnings (loss) attributable to noncontrolling interests	146	(1,307)	(1,905)
Net Earnings Attributable to Martin Marietta	288,792	155,601	121,337
Net Earnings (Loss) Attributable to Martin Marietta
Earnings from continuing operations	288,792	155,638	122,086
Discontinued operations		(37)	(749)
Net Earnings Attributable to Martin Marietta	$ 288,792	$ 155,601	$ 121,337
Net Earnings (Loss) Attributable to Martin Marietta Per Common Share (see Note A)
Basic from continuing operations attributable to common shareholders	$ 4.31	$ 2.73	$ 2.64
Discontinued operations attributable to common shareholders			(0.02)
Earnings Per Share, Basic, Total	4.31	2.73	2.62
Diluted from continuing operations attributable to common shareholders	4.29	2.71	2.63
Discontinued operations attributable to common shareholders			(0.02)
Earnings Per Share, Diluted, Total	$ 4.29	$ 2.71	$ 2.61
Weighted-Average Common Shares Outstanding
Basic	66,770	56,854	46,164
Diluted	67,020	57,088	46,285

Consolidated Statements of Ear3

Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Loss on discontinued operations, related tax benefit	$ 0	$ 40	$ 417

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Consolidated Net Earnings	$ 288,938	$ 154,294	$ 119,432
Defined benefit pension and postretirement plans:
Net (loss) gain arising during period, net of tax of $(4,530), $(39,752) and $36,294, respectively	(7,101)	(62,767)	55,472
Amortization of prior service credit, net of tax of $(731), $(1,108) and $(1,111), respectively	(1,149)	(1,702)	(1,696)
Amortization of actuarial loss, net of tax of $6,551, $1,490 and $6,211, respectively	10,299	2,289	9,493
Amount recognized in net periodic pension cost due to settlement, net of tax of $289			440
Amount recognized in net periodic pension cost due to special plan termination benefits, net of tax of $811	1,274
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,323	(62,180)	63,709
Foreign currency translation loss	(3,542)	(624)	(2,255)
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, net of tax of $509, $470 and $438, respectively	771	718	670
Other Comprehensive Income (Loss), Net of Tax	552	(62,086)	62,124
Consolidated comprehensive earnings	289,490	92,208	181,556
Less: Comprehensive earnings (loss) attributable to noncontrolling interests	161	(1,348)	(1,836)
Comprehensive Earnings Attributable to Martin Marietta	$ 289,329	$ 93,556	$ 183,392

Consolidated Statements of Com5

Consolidated Statements of Comprehensive Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) gain arising during period, tax	$ (4,530)	$ (39,752)	$ 36,294
Amortization of prior service credit, tax	(731)	(1,108)	(1,111)
Amortization of actuarial loss, tax	6,551	1,490	6,211
Amount recognized in net periodic pension cost due to settlement, tax			289
Amount recognized in net periodic pension cost due to special plan termination benefits, tax	811
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, tax	$ 509	$ 470	$ 438

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 168,409	$ 108,651
Accounts receivable, net	410,921	421,001
Inventories, net	469,141	484,919
Other current assets	33,697	29,607
Total Current Assets	1,082,168	1,044,178
Property, plant and equipment, net	3,156,000	3,402,770
Goodwill	2,068,235	2,068,799
Other noncurrent assets	144,777	108,802
Total Assets	6,961,732	7,219,754
Current Liabilities:
Bank overdraft	10,235	183
Accounts payable	164,718	202,476
Accrued salaries, benefits and payroll taxes	30,939	36,576
Pension and postretirement benefits	8,168	6,953
Accrued insurance and other taxes	62,781	58,356
Current maturities of long-term debt	19,246	14,336
Other current liabilities	71,104	77,768
Total Current Liabilities	367,191	396,648
Long-term debt	1,553,649	1,571,059
Pension, postretirement and postemployment benefits	224,538	249,333
Deferred income taxes, net	583,459	489,945
Other noncurrent liabilities	172,718	160,021
Total Liabilities	2,901,555	2,867,006
Equity:
Common stock ($0.01 par value; 100,000,000 shares authorized; 64,479,000 and 67,293,000 shares outstanding at December 31, 2015 and 2014, respectively)	$ 643	$ 671
Preferred stock ($0.01 par value; 10,000,000 shares authorized; no shares outstanding)
Additional paid-in capital	$ 3,287,827	$ 3,243,619
Accumulated other comprehensive loss	(105,622)	(106,159)
Retained earnings	874,436	1,213,035
Total Shareholders’ Equity	4,057,284	4,351,166
Noncontrolling interests	2,893	1,582
Total Equity	4,060,177	4,352,748
Total Liabilities and Equity	6,961,732	7,219,754
Operating Permits
Current Assets:
Intangibles, net	444,725	499,487
Other Intangible Assets
Current Assets:
Intangibles, net	$ 65,827	$ 95,718

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
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	64,479,000	67,293,000
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, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Consolidated net earnings	$ 288,938	$ 154,294	$ 119,432
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	263,587	222,746	173,761
Stock-based compensation expense	13,589	8,993	7,008
Loss (gains) on divestitures and sales of assets	14,093	(52,297)	(2,265)
Deferred income taxes	85,225	50,292	24,113
Excess tax benefits from stock-based compensation transactions		(2,508)	(2,368)
Other items, net	(5,972)	4,795	(429)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	12,309	(16,650)	(22,523)
Inventories, net	(21,525)	(12,020)	(11,639)
Accounts payable	(40,053)	5,303	20,063
Other assets and liabilities, net	(37,040)	18,710	3,798
Net Cash Provided by Operating Activities	573,151	381,658	308,951
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(318,232)	(232,183)	(155,233)
Acquisitions, net	(43,215)	(189)	(64,478)
Cash received in acquisition	63	59,887
Proceeds from divestitures and sales of assets	448,122	121,985	8,564
Payment of railcar construction advances	(25,234)	(14,513)
Reimbursement of railcar construction advances	25,234	14,513
Repayments from affiliate	1,808	1,175
Loan to affiliate			(3,402)
Net Cash Provided By (Used for) Investing Activities	88,546	(49,325)	(214,549)
Cash Flows from Financing Activities:
Borrowings of long-term debt	230,000	868,762	604,417
Repayments of long-term debt	(244,704)	(1,057,289)	(621,142)
Debt issuance costs		(2,782)	(2,148)
Change in bank overdraft	10,052	(2,373)	2,556
Payments on capital lease obligations	(6,616)	(3,075)	(28)
Dividends paid	(107,462)	(91,304)	(74,197)
Distributions to owners of noncontrolling interests	(325)	(800)	(876)
Repurchase of common stock	(519,962)
Purchase of remaining interest in existing subsidiaries		(19,480)
Issuances of common stock	37,078	39,714	11,691
Excess tax benefits from stock-based compensation transactions		2,508	2,368
Net Cash Used for Financing Activities	(601,939)	(266,119)	(77,359)
Net Increase in Cash and Cash Equivalents	59,758	66,214	17,043
Cash and Cash Equivalents, beginning of year	108,651	42,437	25,394
Cash and Cash Equivalents, end of year	168,409	108,651	42,437
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	71,011	81,304	52,034
Cash paid for income taxes	$ 46,774	$ 15,955	$ 23,491

Consolidated Statements of Tota

Consolidated Statements of Total Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Earnings	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2012	$ 1,450,299	$ 459	$ 414,657	$ (106,169)	$ 1,101,598	$ 1,410,545	$ 39,754
Beginning Balance (in shares) at Dec. 31, 2012		46,002,000
Consolidated net earnings (loss)	119,432				121,337	121,337	(1,905)
Other comprehensive earnings (loss)	62,124			62,055		62,055	69
Dividends declared ($1.60 per common share)	(74,197)				(74,197)	(74,197)
Issuances of common stock for stock award plans	$ 11,129	$ 2	11,127			11,129
Issuances of common stock for stock award plans (in shares)		259,000
Repurchases of common stock, Shares	0
Stock-based compensation expense	$ 7,008		7,008			7,008
Distributions to owners of noncontrolling interests	(876)						(876)
Ending Balance at Dec. 31, 2013	1,574,919	$ 461	432,792	(44,114)	1,148,738	1,537,877	37,042
Ending Balance (in shares) at Dec. 31, 2013		46,261,000
Consolidated net earnings (loss)	154,294				155,601	155,601	(1,307)
Other comprehensive earnings (loss)	(62,086)			(62,045)		(62,045)	(41)
Dividends declared ($1.60 per common share)	(91,304)				(91,304)	(91,304)
Issuances of common stock, stock options and stock appreciation rights for TXI acquisition	2,751,873	$ 203	2,751,670			2,751,873
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	$ 7	41,765			41,772
Issuances of common stock for stock award plans (in shares)		723,000
Repurchases of common stock, Shares	0
Stock-based compensation expense	$ 8,993		8,993			8,993
Distributions to owners of noncontrolling interests	(800)						(800)
Purchase of subsidiary shares from noncontrolling interest	(24,913)		8,399			8,399	(33,312)
Ending Balance at Dec. 31, 2014	$ 4,352,748	$ 671	3,243,619	(106,159)	1,213,035	4,351,166	1,582
Ending Balance (in shares) at Dec. 31, 2014	67,293,000	67,293,000
Consolidated net earnings (loss)	$ 288,938				288,792	288,792	146
Other comprehensive earnings (loss)	552			537		537	15
Dividends declared ($1.60 per common share)	(107,462)				(107,462)	(107,462)
Issuances of common stock for stock award plans	30,624	$ 5	30,619			30,624
Issuances of common stock for stock award plans (in shares)		471,000
Repurchases of common stock	$ (519,962)	$ (33)			(519,929)	(519,962)
Repurchases of common stock, Shares	(3,285,380)	(3,285,000)
Stock-based compensation expense	$ 13,589		13,589			13,589
Minority interest acquired via business combination	1,475						1,475
Distributions to owners of noncontrolling interests	(325)						(325)
Ending Balance at Dec. 31, 2015	$ 4,060,177	$ 643	$ 3,287,827	$ (105,622)	$ 874,436	$ 4,057,284	$ 2,893
Ending Balance (in shares) at Dec. 31, 2015	64,479,000	64,479,000

Consolidated Statements of To10

Consolidated Statements of Total Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 1.60	$ 1.60	$ 1.60

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2015
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 accounted for 55% of consolidated 2015 net sales and 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 (which accounted for 27% of consolidated 2015 net sales), are sold and shipped from a network of more than 400 quarries, distribution facilities and plants to customers in 36 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, 2015, 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 70% of the Aggregates business’ 2015 net sales: Texas, Colorado, North Carolina, Iowa and Georgia. The Cement segment, accounting for 11% of consolidated 2015 net sales, produces Portland and specialty cements. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. Texas and California accounted for 72% and 25%, respectively, of the Cement business’ 2015 net sales. In September 2015, the Corporation divested of its California cement operations. The Magnesia Specialties segment, accounting for 7% of consolidated 2015 net sales, 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 best estimates and judgment. Management evaluates its 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 of these estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these 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. Early Adoption of New Accounting Standard. Effective December 31, 2015, the Corporation early adopted the Financial Accounting Standard Board’s (the “FASB”) final guidance on the balance sheet classification of deferred taxes. The guidance requires deferred tax assets and liabilities to be classified as noncurrent rather than split between current and noncurrent; however, deferred tax assets and liabilities from different federal, state and foreign jurisdictions are not netted for financial statement presentation. The adoption of Accounting Standards Update 2015-17, Balance Sheet Classification of Deferred Taxes, had no impact on the Corporation’s consolidated shareholders’ equity, results of operations or cash flows. Retrospective application is allowed and $244,638,000 of current deferred tax assets was reclassed into deferred income taxes, net, on the consolidated balance sheet as of December 31, 2014 to conform with current year presentation. 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 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 for interim and annual reporting periods beginning after December 31, 2017 and can be applied on a full retrospective or modified retrospective approach. The Corporation is currently evaluating the impact of the provisions of the new standard, and at this time does not expect the impact to be material to its results of operations. 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 Corporation’s 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 that short-term operating cash needs are met and that excess funds are managed efficiently. The Corporation subsidizes shortages in operating cash through short-term borrowing facilities. The Corporation utilizes excess cash to either pay down short-term 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 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 its 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 that 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 based on the amount in excess of 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 Corporation uses the accelerated expense recognition method for stock options. 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 expenses the fair value of restricted stock awards, incentive compensation awards and Board of Directors’ fees paid in the form of common stock based on the closing price of the Corporation’s common stock on the awards’ respective grant dates. 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, 2014 and 2013 were: 2015 2014 2013 Risk-free interest rate 2.20% 2.50% 1.70% Dividend yield 1.20% 1.50% 1.80% Volatility factor 36.10% 35.30% 35.40% Expected term 8.5 years 8.5 years 8.6 years Based on these assumptions, the weighted-average fair value of each stock option granted was $57.71, $43.42 and $36.48 for 2015, 2014 and 2013, 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. 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. 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 estimate of 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 tax, 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. 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. Because of 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 construction contracts carry longer warranty periods, ranging from two to ten years, 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, 2015, 2014 and 2013. 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) 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 (loss) earnings, 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 2013 Accumulated other comprehensive (loss) earnings at beginning of period $ (108,189 ) $ 6,157 $ (4,137 ) $ (106,169 ) Other comprehensive earnings (loss) before reclassifications, net of tax 55,403 (2,255 ) — 53,148 Amounts reclassified from accumulated other comprehensive loss, net of tax 8,237 — 670 8,907 Other comprehensive earnings (loss), net of tax 63,640 (2,255 ) 670 62,055 Accumulated other comprehensive (loss) earnings at end of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Cumulative noncurrent deferred tax assets at end of period $ 29,198 $ — $ 2,269 $ 31,467 Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2015 2014 2013 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 2,085 $ — $ — Settlement charge — — 729 Amortization of: Prior service credit (1,880 ) (2,810 ) (2,807 ) Actuarial loss 16,850 3,779 15,704 17,055 969 13,626 Cost of sales; Selling, general & administrative expenses Tax effect (6,631 ) (382 ) (5,389 ) Taxes on income Total $ 10,424 $ 587 $ 8,237 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,280 $ 1,188 $ 1,108 Interest expense Tax effect (509 ) (470 ) (438 ) Taxes on income Total $ 771 $ 718 $ 670 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, 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. 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) 2015 2014 2013 Net earnings from continuing operations attributable to Martin Marietta $ 288,792 $ 155,638 $ 122,086 Less: Distributed and undistributed earnings attributable to unvested awards 1,252 647 513 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 287,540 154,991 121,573 Basic and diluted net loss attributable to common shareholders from discontinued operations — (37 ) (749 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 287,540 $ 154,954 $ 120,824 Basic weighted-average common shares outstanding 66,770 56,854 46,164 Effect of dilutive employee and director awards 250 234 121 Diluted weighted-average common shares outstanding 67,020 57,088 46,285 Reclassifications. Effective January 1, 2014, the Corporation reorganized the operations and management reporting structure of the Aggregates business, resulting in a change to the reportable segments. Segment information for 2013 has been reclassified to conform to the presentation of the current reportable segments.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note B: Goodwill and 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) 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 2014 Balance at beginning of period $ 263,967 $ 50,346 $ 302,308 $ — $ 616,621 Division reorganization 18,150 — (18,150 ) — — Acquisitions — — 600,372 883,900 1,484,272 Divestitures — — (32,094 ) — (32,094 ) Balance at end of period $ 282,117 $ 50,346 $ 852,436 $ 883,900 $ 2,068,799 Intangible assets subject to amortization consist of the following: December 31 Gross Amount Accumulated Amortization Net Balance (add 000) 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 2014 Noncompetition agreements $ 6,274 $ (5,971 ) $ 303 Customer relationships 36,610 (7,654 ) 28,956 Operating permits 498,462 (5,575 ) 492,887 Use rights and other 15,385 (6,940 ) 8,445 Trade names 12,800 (1,143 ) 11,657 Total $ 569,531 $ (27,283 ) $ 542,248 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) 2015 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,175 9,137 — 19,312 Trade names — 280 2,565 2,845 Total $ 16,775 $ 9,417 $ 2,565 $ 28,757 2014 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 9,975 19,437 — 29,412 Trade names — 14,380 2,565 16,945 Total $ 16,575 $ 33,817 $ 2,565 $ 52,957 During 2015, the Corporation acquired $2,953,000 of intangibles, consisting of the following: (add 000, except year data) Amount Weighted-average amortization period Subject to amortization: Customer relationships $ 375 13.3 years Operating permits 1,017 26.5 years Use rights and other 1,361 22.1 years 2,753 22.5 years Not subject to amortization: Use rights 200 N/A 200 Total $ 2,953 Use rights include, but are not limited to, water rights, subleases and proprietary information. Total amortization expense for intangible assets for the years ended December 31, 2015, 2014 and 2013 was $13,962,000, $9,311,000 and $3,587,000, respectively. The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows: (add 000) 2016 $ 13,431 2017 13,345 2018 12,557 2019 11,665 2020 11,630 Thereafter 419,167 Total $ 481,795

Business Combinations and Dives

Business Combinations and Divestitures	12 Months Ended
	Dec. 31, 2015
Business Combinations And Dispositions [Abstract]
Business Combinations and Divestitures	Note C: Business Combinations and Divestitures Business Combinations. The Corporation acquired Texas Industries, Inc. (“TXI”) on July 1, 2014. Total revenues and earnings from operations included in the consolidated statements of earnings attributable to TXI were $941,499,000 and $70,121,000, respectively, for the year ended December 31, 2015 and $539,061,000 and $42,239,000, respectively, for the period July 1, 2014 through December 31, 2014. Acquisition and integration expenses associated with TXI were $6,762,000 and $90,487,000 for the years ended December 31, 2015 and December 31, 2014, respectively. Unaudited Pro Forma Financial Information. The pro forma financial information in the table below summarizes the combined consolidated results of operations for the Corporation and TXI as though the companies were combined as of January 1, 2013. Transactions between Martin Marietta and TXI during the periods presented in the pro forma financial statements have been eliminated as if Martin Marietta and TXI were consolidated affiliates during the periods. The unaudited pro forma financial information for the year ended December 31, 2014 includes TXI’s historical operating results for the six months ended May 31, 2014 (due to a difference in TXI’s historical reporting periods) and the results of operations for the TXI locations from July 1, 2014, the acquisition date, to December 31, 2014. The pro forma financial information presented below is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place as of January 1, 2013. year ended December 31 (add 000) 2014 Net Sales $ 3,088,642 Earnings from continuing operations attributable to controlling interests $ 171,822 Divestiture of Assets. On September 30, 2015, the Corporation divested its California cement operations, which were reported in the Cement segment. These operations were not in close proximity to other core assets of the Corporation and, unlike other marketplace competitors, were not vertically integrated with ready mixed concrete production. The divestiture primarily included a cement plant, two distribution terminals, mobile equipment, intangible assets and inventory. In accordance with the asset purchase agreement, the liabilities assumed by the purchaser included asset retirement obligations. The Corporation received proceeds of $420,000,000 and recognized a loss of $24,214,000 on the sale, inclusive of transaction-related accruals. The Corporation also recognized other disposal-related expenses of $4,849,000. The loss and related expenses are included in other operating expenses, net, in the consolidated statement of earnings.

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Accounts Receivable, Net	Note D: Accounts Receivable, Net December 31 (add 000) 2015 2014 Customer receivables $ 408,551 $ 418,016 Other current receivables 9,310 7,062 417,861 425,078 Less allowances (6,940 ) (4,077 ) Total $ 410,921 $ 421,001 Of the total accounts receivable, net, balances, $3,794,000 and $3,765,000 at December 31, 2015 and 2014, respectively, were due from unconsolidated affiliates.

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventories, Net	Note E: Inventories, Net December 31 (add 000) 2015 2014 Finished products $ 433,649 $ 413,766 Products in process and raw materials 55,194 65,250 Supplies and expendable parts 110,882 125,092 599,725 604,108 Less allowances (130,584 ) (119,189 ) Total $ 469,141 $ 484,919

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	Note F: Property, Plant and Equipment, Net December 31 (add 000) 2015 2014 Land and land improvements $ 865,700 $ 849,704 Mineral reserves and interests 1,001,295 990,438 Buildings 144,076 157,233 Machinery and equipment 3,473,826 3,568,342 Construction in progress 128,301 125,959 5,613,198 5,691,676 Less allowances for depreciation, depletion and amortization (2,457,198 ) (2,288,906 ) Total $ 3,156,000 $ 3,402,770 The gross asset value and related allowance for amortization for machinery and equipment recorded under capital leases at December 31 were as follows: (add 000) 2015 2014 Machinery and equipment under capital leases $ 19,379 $ 25,775 Less allowance for amortization (5,102 ) (2,808 ) Total $ 14,277 $ 22,967 Depreciation, depletion and amortization expense related to property, plant and equipment was $246,874,000, $211,242,000 and $168,333,000 for the years ended December 31, 2015, 2014 and 2013, respectively. Depreciation, depletion and amortization expense for 2015 and 2014 includes amortization of machinery and equipment under capital leases. Interest cost of $5,832,000, $8,033,000 and $1,792,000 was capitalized during 2015, 2014 and 2013, respectively. At December 31, 2015 and 2014, $58,937,000 and $68,340,000, 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, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Note G: Long-Term Debt December 31 (add 000) 2015 2014 6.6% Senior Notes, due 2018 $ 299,368 $ 299,123 7% Debentures, due 2025 124,532 124,500 6.25% Senior Notes, due 2037 228,223 228,184 4.25% Senior Notes, due 2024 395,717 395,309 Floating Rate Notes, due 2017, interest rate of 1.71% and 1.33% at December 31, 2015 and 2014, respectively 299,318 298,869 Term Loan Facility, due 2018, interest rate of 1.86% and 1.67% at December 31, 2015 and 2014, respectively 224,075 236,258 Other notes 1,662 3,152 Total 1,572,895 1,585,395 Less current maturities (19,246 ) (14,336 ) Long-term debt $ 1,553,649 $ 1,571,059 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. All Senior Notes and Debentures are carried net of original issue discount, which is being amortized by the effective interest method over the life of the issue. Senior Notes are redeemable prior to their respective maturity dates. The principal amount, effective interest rate and maturity date for the Corporation’s Senior Notes and Debentures 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 LIBOR+1.10% June 30, 2017 Borrowings under the Senior Unsecured Credit Facilities bear interest, at the Corporation’s option, at rates based upon the London Interbank Offered Rate (“LIBOR”) or a base rate, plus, for each rate, a margin determined in accordance with a ratings-based pricing grid. 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” and together with the Floating Rate Notes, the “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 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. The Corporation has a credit agreement with JPMorgan Chase Bank, N.A., as Administrative Agent, Wells Fargo Bank, N.A., Branch Banking and Trust Company (“BB&T”) and SunTrust Bank, as Co-Syndication Agents, and the lenders party thereto (the “Credit Agreement”). The Credit Agreement provides a $250,000,000 senior unsecured term loan (the “Term Loan Facility”) and a $350,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”, and together with the Term Loan Facility, the “Senior Unsecured Credit Facilities”). The Senior Unsecured Credit Facilities are syndicated with the following banks: Lender (add 000) Revolving Facility Commitment Term Loan Facility Commitment JPMorgan Chase Bank, N.A. $ 46,667 $ 33,333 Wells Fargo Bank, N.A. 46,667 33,333 BB&T 46,667 33,333 SunTrust Bank 46,667 33,333 Deutsche Bank AG New York Branch 46,667 33,333 PNC Bank, National Association 29,167 20,833 Regions Bank 29,167 20,833 The Northern Trust Company 29,167 20,833 Comerica Bank 14,582 10,418 The Bank of Tokyo-Mitsubishi UFJ, Ltd. 14,582 10,418 Total $ 350,000 $ 250,000 The Corporation’s Credit Agreement requires the Corporation’s ratio of consolidated 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 for a period of 180 days so long as the Corporation, as a consequence of such specified acquisition, does not have its rating on long-term unsecured debt fall below BBB by Standard & Poor’s or Baa2 by Moody’s as a result of the acquisition, and 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 Facility, 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, 2015. In 2014, the Corporation amended the Credit Agreement to ensure the impact of the business combination with TXI did not impair liquidity available under the Term Loan Facility and the Revolving Facility. The amendment adjusted consolidated EBITDA, as defined, to add back fees, costs or expenses relating to the TXI business combination incurred on or prior to the closing of the combination not to exceed $95,000,000; any integration or similar costs or expenses related to the TXI business combination incurred in any period prior to the second anniversary of the closing of the TXI business combination not to exceed $70,000,000; and any make-whole fees incurred in connection with the redemption of TXI’s 9.25% senior notes due 2020. Under the Term Loan Facility, the Corporation made required quarterly principal payments equal to 1.25% of the original principal balance during 2015 and is required to make quarterly principal payments equal to 1.875% of the remaining principal balance during the remaining years, with the remaining outstanding principal, together with interest accrued thereon, due in full on November 29, 2018. The Revolving Facility expires on November 29, 2018, 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, 2015 and 2014, 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 $250,000,000 trade receivable securitization facility (the “Trade Receivable Facility”), which matures on September 30, 2016. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, National Association and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined, of $364,419,000 and $369,575,000 at December 31, 2015 and 2014, respectively. These receivables are originated by the Corporation and then sold to the special-purpose subsidiary wholly-owned by the Corporation. Borrowings under the Trade Receivable Facility bear interest at a rate equal to one-month LIBOR plus 0.7% and are limited to the lesser of the facility limit or the borrowing base, as defined, of $282,258,000 and $313,428,000 at December 31, 2015 and 2014, respectively. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special-purpose subsidiary. The Corporation’s long-term debt maturities for the five years following December 31, 2015, and thereafter are: (add 000) 2016 $ 19,246 2017 318,028 2018 486,843 2019 90 2020 60 Thereafter 748,628 Total $ 1,572,895 The Corporation has a $5,000,000 short-term line of credit. No amounts were outstanding under this line of credit at December 31, 2015 or 2014. Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the years ended December 31, 2015, 2014 and 2013, the Corporation recognized $1,280,000, $1,188,000 and $1,108,000, 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, 2015
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 $1,572,895,000 and $1,625,193,000, respectively, at December 31, 2015 and $1,585,395,000 and $1,680,584,000, respectively, at December 31, 2014. 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, 2015
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) 2015 2014 2013 Federal income taxes: Current $ 20,627 $ 35,313 $ 30,856 Deferred 85,295 46,616 8,399 Total federal income taxes 105,922 81,929 39,255 State income taxes: Current 18,153 10,307 3,201 Deferred 930 3,376 478 Total state income taxes 19,083 13,683 3,679 Foreign income taxes: Current 99 1,262 972 Deferred (241 ) (2,027 ) 139 Total foreign income taxes (142 ) (765 ) 1,111 Total taxes on income $ 124,863 $ 94,847 $ 44,045 The increase in federal deferred tax expense in 2015 and 2014 is attributable to the utilization of net operating loss carryforwards acquired in the acquisition of TXI to the extent allowed. For the years ended December 31, 2015 and 2014, the benefit related to the utilization of federal NOL carryforwards, reflected in current tax expense, was $156,554,000 and $16,940,000, 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 years ended December 31, 2014 and 2013, excess tax benefits attributable to stock-based compensation transactions that were recorded to shareholders’ equity amounted to $2,508,000 and $2,368,000, respectively. For the years ended December 31, 2015, 2014 and 2013, foreign pretax loss was $1,175,000, $10,557,000 and $10,277,000, respectively. In 2014, current foreign tax expense primarily related to unrecognized tax benefits for tax positions taken in prior years and the deferred foreign tax benefit primarily related to the true-up of deferred tax liabilities. In 2013, current foreign tax expense was primarily attributable to the settlement of the Canadian Advance Pricing Agreement (“APA”). The tax effect of currency translations included in foreign taxes was immaterial. 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 2015 2014 2013 Statutory tax rate 35.0 % 35.0 % 35.0 % (Reduction) increase resulting from: Effect of statutory depletion (7.8 ) (9.6 ) (12.0 ) State income taxes 3.0 3.6 1.5 Domestic production deduction (0.1 ) (0.9 ) (2.1 ) Transfer pricing — (0.2 ) 0.9 Goodwill write off 0.4 3.9 — Foreign tax rate differential — 1.3 2.1 Disallowed compensation 0.2 3.7 0.3 Purchase accounting transaction costs — 2.4 — Other items (0.5 ) (1.1 ) 1.1 Effective income tax rate 30.2 % 38.1 % 26.8 % 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 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 $222,000, or less than $0.01 per diluted share, in 2015, $3,239,000, or $0.05 per diluted share, in 2014, and $3,979,000, or $0.09 per diluted share, in 2013. 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 in 2014 in connection with the TXI acquisition that are not deductible for income tax purposes, which 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) 2015 2014 Deferred tax assets related to: Employee benefits $ 56,302 $ 74,288 Inventories 75,907 64,484 Valuation and other reserves 42,857 48,278 Net operating loss carryforwards 11,448 171,781 Accumulated other comprehensive loss 67,757 70,367 Alternative Minimum Tax credit carryforward 48,197 28,809 Gross deferred tax assets 302,468 458,007 Valuation allowance on deferred tax assets (8,967 ) (6,133 ) Total net deferred tax assets 293,501 451,874 Deferred tax liabilities related to: Property, plant and equipment (593,767 ) (638,730 ) Goodwill and other intangibles (266,436 ) (288,471 ) Other items, net (16,757 ) (14,618 ) Total deferred tax liabilities (876,960 ) (941,819 ) Net deferred tax liability $ (583,459 ) $ (489,945 ) The increase in the net deferred tax liability is primarily a result of the utilization of deferred tax assets related to net operating loss (“NOL”) carryforwards, offset by the recognition of deferred tax liabilities resulting from the sale of the California cement operations. Deferred tax assets for employee benefits result from the temporary differences between the deductions for pension and postretirement obligations 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 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. Deferred tax assets are carried on stock options with exercise prices in excess of the Corporation’s stock price at December 31, 2015. If these options expire without being exercised, the deferred tax assets are written off by reducing the pool of excess tax benefits to the extent available and expensing any excess. The Corporation had domestic federal and state net operating loss carryforwards of $273,251,000 (federal $33,863,000; state $239,388,000) and $710,163,000 (federal $465,467,000; state $244,696,000) at December 31, 2015 and 2014, respectively. These carryforwards have various expiration dates through 2035. At December 31, 2015 and 2014, deferred tax assets associated with these carryforwards were $11,448,000 and $171,781,000, respectively, net of unrecognized tax benefits, for which valuation allowances of $8,690,000 and $5,084,000, respectively, were recorded. The Corporation recorded a $3,714,000 valuation reserve in 2015 for certain state net operating loss carryforwards, which was driven by the sale of the California cement operations. The Corporation also had domestic tax credit carryforwards of $3,179,000 and $3,682,000 at December 31, 2015 and 2014, respectively, for which valuation allowances were recorded in the amount of $277,000 and $1,049,000 at December 31, 2015 and 2014, respectively. Federal tax credit carryforwards recorded at December 31, 2015 will begin to expire in 2025. State tax credit carryforwards recorded at December 31, 2015 expire in 2018. At December 31, 2015, the Corporation also had Alternative Minimum Tax (“AMT”) credit carryforwards of $48,197,000, which do not expire. 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. No deferred tax liabilities were recorded on goodwill acquired in the TXI acquisition. 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 Canadian subsidiary’s undistributed net earnings are estimated to be $32,284,000 for the year ended December 31, 2015. The unrecognized deferred tax liability for temporary differences related to the investment in the wholly-owned Canadian subsidiary is estimated to be $1,815,000 for the year ended December 31, 2015. The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects: years ended December 31 (add 000) 2015 2014 2013 Unrecognized tax benefits at beginning of year $ 21,107 $ 11,826 $ 15,380 Gross increases – tax positions in prior years 3,079 2,075 9,845 Gross decreases – tax positions in prior years (3,512 ) (203 ) (5,121 ) Gross increases – tax positions in current year 4,978 3,369 2,540 Gross decreases – tax positions in current year (594 ) (51 ) (529 ) Settlements with taxing authorities — — (8,599 ) Lapse of statute of limitations (6,331 ) (1,872 ) (1,690 ) Unrecognized tax benefits assumed with acquisition — 5,963 — Unrecognized tax benefits at end of year $ 18,727 $ 21,107 $ 11,826 For the year ended December 31, 2014, the unrecognized tax benefits assumed with acquisition included positions acquired in the acquisition of TXI. For the year ended December 31, 2013, settlements with taxing authorities related to the Canadian APA settlement. At December 31, 2015, 2014 and 2013, unrecognized tax benefits of $7,975,000, $9,362,000 and $6,301,000, 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 begun 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 $1,455,000, excluding indirect benefits, during the twelve months ending December 31, 2016 due to the expiration of the statute of limitations for the 2011 and 2012 tax years. For the years ended December 31, 2015, 2014 and 2013, $2,364,000 or $0.04 per diluted share, $687,000 or $0.01 per diluted share, and $1,368,000 or $0.03 per diluted share, respectively, were reversed into income upon the statute of limitations expiration for the 2009, 2010 and 2011 tax years. The Corporation’s open tax years subject to federal, state or foreign examinations are 2011 through 2015.

Retirement Plans, Postretiremen

Retirement Plans, Postretirement and Postemployment Benefits	12 Months Ended
	Dec. 31, 2015
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. In connection with the TXI acquisition in 2014, the Corporation assumed three defined benefit plans, including two pension plans and a postretirement health benefit plan. The assets and obligations associated with these plans are reflected in the assets and obligations as of December 31, 2015 and 2014, in the tables below. 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 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) 2015 2014 2013 Components of net periodic benefit cost: Service cost $ 23,001 $ 17,125 $ 16,121 Interest cost 33,151 28,935 23,016 Expected return on assets (36,385 ) (32,661 ) (26,660 ) Amortization of: Prior service cost 422 445 449 Actuarial loss 17,159 4,045 15,679 Transition asset (1 ) (1 ) (1 ) Settlement charge — — 729 Termination benefit charge 2,085 13,652 — Net periodic benefit cost $ 39,432 $ 31,540 $ 29,333 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) 2015 2014 2013 Actuarial loss (gain) $ 9,916 $ 105,546 $ (90,755 ) Amortization of: Prior service cost (422 ) (445 ) (449 ) Actuarial loss (17,159 ) (4,045 ) (15,679 ) Transition asset 1 1 1 Special plan termination benefits (2,085 ) — — Settlement charge — — (729 ) Net prior service cost 2,338 — — Total $ (7,411 ) $ 101,057 $ (107,611 ) Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost: December 31 2015 2014 (add 000) Gross Net of tax Gross Net of tax Prior service cost $ 1,028 $ 628 $ 1,197 $ 729 Actuarial loss 178,770 108,874 186,013 113,288 Transition asset (8 ) (5 ) (9 ) (5 ) Total $ 179,790 $ 109,497 $ 187,201 $ 114,012 The prior service cost, actuarial loss and transition asset expected to be recognized in net periodic benefit cost during 2016 are $350,000 (net of deferred taxes of $136,000), $11,318,000 (net of deferred taxes of $4,403,000) and $1,000, respectively. These amounts are included in accumulated other comprehensive loss at December 31, 2015. The defined benefit plans’ change in projected benefit obligation is as follows: years ended December 31 (add 000) 2015 2014 Change in projected benefit obligation: Net projected benefit obligation at beginning of year $ 753,975 $ 496,040 Service cost 23,001 17,125 Interest cost 33,151 28,935 Actuarial (gain) loss (27,119 ) 99,071 Gross benefits paid (30,803 ) (23,489 ) Acquisitions — 122,641 Nonrecurring termination benefit 2,338 13,652 Net projected benefit obligation at end of year $ 754,543 $ 753,975 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) 2015 2014 Change in plan assets: Fair value of plan assets at beginning of year $ 524,042 $ 443,973 Actual return on plan assets, net (651 ) 26,186 Employer contributions 53,924 25,654 Gross benefits paid (30,803 ) (23,489 ) Acquisitions — 51,718 Fair value of plan assets at end of year $ 546,512 $ 524,042 years ended December 31 (add 000) 2015 2014 Funded status of the plan at end of year $ (208,031 ) $ (229,933 ) Accrued benefit cost $ (208,031 ) $ (229,933 ) December 31 (add 000) 2015 2014 Amounts recognized on consolidated balance sheets consist of: Current liability $ (6,048 ) $ (4,183 ) Noncurrent liability (201,983 ) (225,750 ) Net amount recognized at end of year $ (208,031 ) $ (229,933 ) The accumulated benefit obligation for all defined benefit pension plans was $688,017,000 and $684,647,000 at December 31, 2015 and 2014, 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) 2015 2014 Projected benefit obligation $ 754,543 $ 753,975 Accumulated benefit obligation $ 688,017 $ 684,647 Fair value of plan assets $ 546,512 $ 524,042 Weighted-average assumptions used to determine benefit obligations as of December 31 are: 2015 2014 Discount rate 4.67% 4.25% 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: 2015 2014 2013 Discount rate 4.25% 5.17% 4.24% Rate of increase in future compensation levels 4.50% 5.00% 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 2015 and 2014, the Corporation estimated the remaining lives of participants in the pension plans using the RP-2014 Mortality Table. The no-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 2015 and the actual pension plan asset allocation by asset class are as follows: Percentage of Plan Assets 2015 December 31 Asset Class Target Allocation 2015 2014 Equity securities 54% 55% 59% Debt securities 30% 31% 29% Hedge funds 8% 7% 4% Real estate 8% 7% 7% Cash 0% 0% 1% 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) 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 High-yield bonds — — — — 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 2014 Equity securities: Mid-sized to large cap $ — $ 219,092 $ — $ 219,092 Small cap, international and emerging growth funds — 87,706 — 87,706 Debt securities: Core fixed income — 154,997 — 154,997 High-yield bonds — — — — Real estate — — 20,363 20,363 Hedge funds — — 38,264 38,264 Cash 3,620 — — 3,620 Total $ 3,620 $ 461,795 $ 58,627 $ 524,042 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) 2015 Balance at beginning of year $ 20,363 $ 38,264 Purchases, sales, settlements, net — — Actual return on plan assets held at period end 2,879 955 Balance at end of year $ 23,242 $ 39,219 2014 Balance at beginning of year $ 19,357 $ 21,764 Purchases, sales, settlements, net 441 15,600 Actual return on plan assets held at period end 565 900 Balance at end of year $ 20,363 $ 38,264 In 2015 and 2014, the Corporation made pension and SERP contributions of $53,924,000 and $25,654,000, respectively. The Corporation currently estimates that it will contribute $29,927,000 to its pension and SERP plans in 2016. 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) 2016 $ 34,226 2017 $ 36,301 2018 $ 38,105 2019 $ 40,327 2020 $ 42,582 Years 2021 - 2025 $ 238,610 Postretirement Benefits . The net periodic postretirement benefit (credit) cost of postretirement plans includes the following components: years ended December 31 (add 000) 2015 2014 2013 Components of net periodic benefit credit: Service cost $ 137 $ 206 $ 227 Interest cost 928 1,164 1,013 Amortization of: Prior service credit (2,302 ) (3,255 ) (3,255 ) Actuarial (gain) loss (309 ) (266 ) 25 Total net periodic benefit credit $ (1,546 ) $ (2,151 ) $ (1,990 ) The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2015 2014 2013 Actuarial gain $ (626 ) $ (3,026 ) $ (1,011 ) Amortization of: Prior service credit 2,302 3,255 3,255 Actuarial gain (loss) 309 266 (25 ) Total $ 1,985 $ 495 $ 2,219 Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost: 2015 2014 (add 000) Gross Net of tax Gross Net of tax Prior service credit $ (4,786 ) $ (2,924 ) $ (7,088 ) $ (4,316 ) Actuarial gain (5,050 ) (3,086 ) (4,733 ) (2,883 ) Total $ (9,836 ) $ (6,010 ) $ (11,821 ) $ (7,199 ) The prior service credit and actuarial gain expected to be recognized in net periodic benefit cost during 2016 is $1,846,000 (net of a deferred tax liability of $718,000) and $382,000 (net of a deferred tax liability of $149,000), respectively, and are included in accumulated other comprehensive loss at December 31, 2015. The postretirement health care plans’ change in benefit obligation is as follows: years ended December 31 (add 000) 2015 2014 Change in benefit obligation: Net benefit obligation at beginning of year $ 25,086 $ 27,352 Service cost 137 206 Interest cost 928 1,164 Participants’ contributions 1,777 2,100 Actuarial gain (627 ) (3,026 ) Gross benefits paid (3,893 ) (4,856 ) Acquisitions — 2,146 Net benefit obligation at end of year $ 23,408 $ 25,086 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) 2015 2014 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Employer contributions 2,116 2,756 Participants’ contributions 1,777 2,100 Gross benefits paid (3,893 ) (4,856 ) Fair value of plan assets at end of year $ — $ — December 31 (add 000) 2015 2014 Funded status of the plan at end of year $ (23,408 ) $ (25,086 ) Accrued benefit cost $ (23,408 ) $ (25,086 ) December 31 (add 000) 2015 2014 Amounts recognized on consolidated balance sheets consist of: Current liability $ (2,120 ) $ (2,770 ) Noncurrent liability (21,288 ) (22,316 ) Net amount recognized at end of year $ (23,408 ) $ (25,086 ) Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are: 2015 2014 Discount rate 4.25 % 3.83 % Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are: 2015 2014 2013 Discount rate 3.83 % 4.42 % 3.54 % For 2015 and 2014, the Corporation estimated the remaining lives of participants in the postretirement plan using the RP-2014 Mortality Table. Assumed health care cost trend rates at December 31 are: 2015 2014 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 2020 2019 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 $ 55 $ (51 ) Postretirement benefit obligation $ 1,312 $ (1,133 ) The Corporation estimates that it will contribute $2,120,000 to its postretirement health care plans in 2016. 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) 2016 $ 2,120 2017 $ 2,344 2018 $ 2,275 2019 $ 2,159 2020 $ 2,051 Years 2021 - 2025 $ 9,170 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 $12,444,000 in 2015, $8,602,000 in 2014 and $7,097,000 in 2013. The increase in matching contributions reflect the participation of the new employees effective July 1, 2014 in connection with the TXI acquisition. Postemployment Benefits. The Corporation had accrued postemployment benefits of $1,267,000 at December 31, 2015 and 2014.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note K: Stock-Based Compensation The shareholders approved, on May 23, 2006, 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”). The Corporation has been authorized by the Board of Directors to repurchase shares of the Corporation’s common stock for issuance under the Plans (see Note M). Under the Plans, the Corporation grants 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, 2015: Number of Options Weighted- Average Exercise Price Weighted-Average Remaining Contractual Life (years) Outstanding at January 1, 2015 1,054,435 $ 96.53 Granted 55,244 $ 154.58 Exercised (367,497 ) $ 101.31 Terminated (56,170 ) $ 135.85 Outstanding at December 31, 2015 686,012 $ 95.43 3.8 Exercisable at December 31, 2015 544,755 $ 87.75 2.7 The weighted-average grant-date exercise price of options granted during 2015, 2014 and 2013 was $154.58, $121.00 and $108.24, respectively. The aggregate intrinsic values of options exercised during the years ended December 31, 2015, 2014 and 2013 were $7,318,000, $9,709,000 and $7,142,000, 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, 2015 were $29,536,000 and $26,925,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2015, which was $136.58. 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 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 specific 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. The following table summarizes information for incentive compensation awards and restricted stock awards as of December 31, 2015: Incentive Compensation Restricted Stock - Service Based Restricted Stock - Performance Based 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, 2015 27,608 $ 101.61 319,230 $ 105.62 16,388 $ 129.14 Awarded 22,035 $ 108.53 48,368 $ 154.26 20,219 $ 108.53 Distributed (11,751 ) $ 99.14 (75,411 ) $ 77.27 — $ — Forfeited (552 ) $ 102.99 (3,624 ) $ 127.06 — $ — December 31, 2015 37,340 $ 106.45 288,563 $ 120.92 36,607 $ 117.76 The weighted-average grant-date fair value of incentive compensation awards granted during 2015, 2014 and 2013 was $108.53, $109.17 and $99.23, respectively. The weighted-average grant-date fair value of service based restricted stock awards granted during 2015, 2014 and 2013 was $154.26, $126.88 and $108.24, respectively. The weighted average grant-date fair value of performance based restricted stock awards granted during 2015 and 2014 was $108.53 and $129.14, respectively. The aggregate intrinsic values for incentive compensation awards and restricted stock awards at December 31, 2015 were $1,920,000 and $44,412,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2015, which was $136.58. The aggregate intrinsic values of incentive compensation awards distributed during the years ended December 31, 2015, 2014 and 2013 were $983,000, $584,000 and $466,000, respectively. The aggregate intrinsic values of restricted stock awards distributed during the years ended December 31, 2015, 2014 and 2013 were $11,387,000, $3,555,000 and $9,413,000, 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. At December 31, 2015, there are approximately 2,099,000 awards available for grant under the Plans. 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, 2015, 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. Under the terms of this plan, 300,000 shares of common stock were reserved for issuance. In 2015, members of the Board of Directors were required to defer at least 20% of their retainer in the form of the Corporation’s common stock at a 20% discount to market value. Nonemployee Board of Directors elected to defer portions of their fees representing 4,035, 3,804 and 6,583 shares of the Corporation’s common stock under this plan during 2015, 2014 and 2013, respectively. The following table summarizes stock-based compensation expense for the years ended December 31, 2015, 2014 and 2013, unrecognized compensation cost for nonvested awards at December 31, 2015 and the weighted-average period over which unrecognized compensation cost is expected to 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: 2015 $ 2,679 $ 9,809 $ 376 $ 725 $ 13,589 2014 $ 2,020 $ 6,189 $ 257 $ 527 8,993 2013 $ 1,734 $ 4,377 $ 229 $ 668 7,008 Unrecognized compensation cost at December 31, 2015: $ 2,718 $ 18,985 $ 334 $ — $ 22,037 Weighted-average period over which unrecognized compensation cost will be recognized: 2.0 years 2.8 years 1.5 years — For the years ended December 31, 2015, 2014 and 2013, the Corporation recognized a deferred tax asset related to stock-based compensation expense of $5,286,000, $3,542,000 and $2,772,000, respectively. The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2015: (add 000) 2016 $ 9,818 2017 6,578 2018 3,817 2019 1,824 2020 — Total $ 22,037 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, 2015
Leases [Abstract]
Leases	Note L: Leases Total lease expense for operating leases was $80,417,000, $59,590,000 and $45,093,000 for the years ended December 31, 2015, 2014 and 2013, 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 $53,658,000, $50,535,000 and $41,604,000 for the years ended December 31, 2015, 2014 and 2013, 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, 2015 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2016 $ 3,166 $ 111,317 2017 2,922 73,106 2018 2,981 55,047 2019 2,691 45,940 2020 1,891 43,692 Thereafter 3,997 272,066 Total 17,648 $ 601,168 Less: imputed interest (2,724 ) Present value of minimum lease payments 14,924 Less: current capital lease obligations (2,438 ) Long-term capital lease obligations $ 12,486 Of the total future minimum commitments, $246,903,000 relates to the Corporation’s contracts of affreightment.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2015
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, 2015, approximately 3,508,000 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 3,285,380 shares of common stock during 2015 and did not repurchase any shares of common stock during 2014 or 2013. At December 31, 2015, 16,714,620 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 rights are subject to adjustment if certain events occur, and they will initially expire on October 21, 2016, if not terminated sooner. The Corporation’s Rights Agreement provides that the Corporation’s Board of Directors may, at its option, redeem all of the outstanding rights at a redemption price of $0.001 per right.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
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 2015, 2014 and 2013 were $6,767,000, $4,584,000 and $3,793,000, 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) 2015 2014 Balance at beginning of year $ 70,422 $ 48,727 Accretion expense 3,336 2,818 Liabilities incurred and assumed in business combinations 14,735 20,984 Liabilities settled (4,490 ) (2,061 ) Revisions in estimated cash flows 5,601 (46 ) Balance at end of year $ 89,604 $ 70,422 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 that 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, but can give no assurance that the ultimate resolution of this matter will not have a material adverse effect on the financial condition or results of operations of the Magnesia Specialties segment. 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, 2015 and 2014, reserves of $45,911,000 and $42,552,000, 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, 2015, the Corporation was contingently liable for $46,263,000 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 sheet. Surety Bonds. In the normal course of business, at December 31, 2015, the Corporation was contingently liable for $326,516,000 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 sheet. Five of these bonds total $88,887,000, or 27% of all outstanding surety bonds. The Corporation has indemnified the underwriting insurance company, Safeco Corporation, a subsidiary of Liberty Mutual Group, 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. 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 2013, the Corporation loaned $3,402,000 to this unconsolidated affiliate to repay in full the outstanding balance of the affiliate’s loan with Bank of America, N.A. and entered into a loan agreement with the affiliate for monthly repayment of principal and interest of that loan. In 2015, the loan was repaid in full. In 2014, the Corporation loaned the unconsolidated affiliate a total of $6,000,000 as an interest-only note due December 29, 2016. Purchase Commitments. The Corporation had purchase commitments for property, plant and equipment of $70,431,000 as of December 31, 2015. The Corporation also had other purchase obligations related to energy and service contracts of $95,389,000 as of December 31, 2015. The Corporation’s contractual purchase commitments as of December 31, 2015 are as follows: (add 000) 2016 $ 155,525 2017 6,457 2018 1,361 2019 451 2020 451 Thereafter 1,575 Total $ 165,820 Capital expenditures in 2015, 2014 and 2013 that were purchase commitments as of the prior year end were $116,681,000, $34,135,000 and $15,839,000, respectively. Employees. Approximately 10% 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, 2015
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, and acquisition-related expenses, net; other operating income and expenses; 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. 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 2015 2014 2013 Mid-America Group $ 926,251 $ 848,855 $ 789,806 Southeast Group 304,472 274,352 245,340 West Group 1,675,021 1,356,283 875,588 Total Aggregates Business 2,905,744 2,479,490 1,910,734 Cement 387,947 221,759 — Magnesia Specialties 245,879 256,702 244,817 Total $ 3,539,570 $ 2,957,951 $ 2,155,551 Net sales Mid-America Group $ 851,854 $ 770,568 $ 720,007 Southeast Group 285,302 254,986 226,437 West Group 1,535,848 1,207,879 771,133 Total Aggregates Business 2,673,004 2,233,433 1,717,577 Cement 367,604 209,556 — Magnesia Specialties 227,508 236,106 225,641 Total $ 3,268,116 $ 2,679,095 $ 1,943,218 Gross profit (loss) Mid-America Group $ 256,586 $ 216,883 $ 192,747 Southeast Group 34,197 10,653 (3,515 ) West Group 254,946 155,678 92,513 Total Aggregates Business 545,729 383,214 281,745 Cement 103,473 52,469 — Magnesia Specialties 78,732 84,594 83,703 Corporate (6,167 ) 2,083 (1,491 ) Total $ 721,767 $ 522,360 $ 363,957 years ended December 31 (add 000) Selling, general and administrative expenses 2015 2014 2013 Mid-America Group $ 52,606 $ 52,217 $ 53,683 Southeast Group 18,467 17,788 18,081 West Group 66,639 50,147 42,929 Total Aggregates Business 137,712 120,152 114,693 Cement 26,626 12,741 — Magnesia Specialties 9,499 9,776 10,165 Corporate 44,397 26,576 25,233 Total $ 218,234 $ 169,245 $ 150,091 Earnings (Loss) from operations Mid-America Group $ 206,820 $ 172,208 $ 144,269 Southeast Group 16,435 (5,293 ) (19,849 ) West Group 205,699 153,182 53,150 Total Aggregates Business 428,954 320,097 177,570 Cement 47,821 40,751 — Magnesia Specialties 68,886 74,805 73,506 Corporate (66,245 ) (120,780 ) (33,088 ) Total $ 479,416 $ 314,873 $ 217,988 Cement intersegment sales, which were to the ready mixed concrete product line in the West Group, were $87,782,000 for the year ended December 31, 2015 and $43,356,000 for the six months ended December 31, 2014. The Cement business was acquired July 1, 2014. years ended December 31 (add 000) Assets employed 2015 2014 2013 Mid-America Group $ 1,304,574 $ 1,290,833 $ 1,242,395 Southeast Group 583,369 604,044 611,906 West Group 2,621,636 2,444,400 1,030,599 Total Aggregates Business 4,509,579 4,339,277 2,884,900 Cement 1,939,796 2,451,799 — Magnesia Specialties 147,795 150,359 154,024 Corporate 364,562 278,319 146,081 Total $ 6,961,732 $ 7,219,754 $ 3,185,005 Depreciation, depletion and amortization Mid-America Group $ 61,693 $ 63,294 $ 66,381 Southeast Group 31,644 31,955 32,556 West Group 93,947 74,283 56,004 Total Aggregates Business 187,284 169,532 154,941 Cement 53,672 30,620 — Magnesia Specialties 13,769 10,394 10,564 Corporate 8,862 12,200 8,256 Total $ 263,587 $ 222,746 $ 173,761 years ended December 31 (add 000) Total property additions 2015 2014 2013 Mid-America Group $ 77,640 $ 76,753 $ 82,667 Southeast Group 12,155 23,326 72,907 West Group 235,245 753,342 53,530 Total Aggregates Business 325,040 853,421 209,104 Cement 9,599 975,063 — Magnesia Specialties 8,916 2,588 4,700 Corporate 20,561 15,349 6,477 Total $ 364,116 $ 1,846,421 $ 220,281 Property additions through acquisitions Mid-America Group $ 4,385 $ — $ 244 Southeast Group — — 54,463 West Group 35,965 632,560 — Total Aggregates Business 40,350 632,560 54,707 Cement — 970,300 — Magnesia Specialties — — — Corporate — — — Total $ 40,350 $ 1,602,860 $ 54,707 Total property additions in the West Group include machinery and equipment of $1,445,000, $7,788,000 and $10,341,000 in 2015, 2014 and 2013 respectively, acquired through capital leases. In 2015, total property additions in Corporate include a $4,088,000 noncash component related to a property addition. The Corporation also acquired $3,591,000 of land via noncash transactions and asset exchanges in 2014. Total property additions through acquisitions in the Mid-America Group reflect $4,385,000 of property, plant and equipment acquired via an asset exchange in 2015. The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include the asphalt, ready mixed concrete and road paving 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. years ended December 31 (add 000) Total revenues 2015 2014 2013 Aggregates $ 2,017,761 $ 1,805,824 $ 1,527,986 Asphalt 72,282 85,822 78,863 Ready Mixed Concrete 657,088 431,229 146,085 Road Paving 158,613 156,615 157,800 Total Aggregates Business 2,905,744 2,479,490 1,910,734 Cement 387,947 221,759 — Magnesia Specialties 245,879 256,702 244,817 Total $ 3,539,570 $ 2,957,951 $ 2,155,551 Net sales Aggregates $ 1,793,660 $ 1,570,022 $ 1,347,486 Asphalt 64,943 76,278 66,216 Ready Mixed Concrete 655,788 430,519 146,079 Road Paving 158,613 156,614 157,796 Total Aggregates Business 2,673,004 2,233,433 1,717,577 Cement 367,604 209,556 — Magnesia Specialties 227,508 236,106 225,641 Total $ 3,268,116 $ 2,679,095 $ 1,943,218 Gross profit (loss) 2015 2014 2013 Aggregates $ 467,053 $ 324,093 $ 259,054 Asphalt 18,189 13,552 12,928 Ready Mixed Concrete 42,942 39,129 8,337 Road Paving 17,545 6,440 1,426 Total Aggregates Business 545,729 383,214 281,745 Cement 103,473 52,469 — Magnesia Specialties 78,732 84,594 83,703 Corporate (6,167 ) 2,083 (1,491 ) Total $ 721,767 $ 522,360 $ 363,957 Domestic and foreign total revenues are as follows: years ended December 31 (add 000) 2015 2014 2013 Domestic $ 3,493,462 $ 2,912,115 $ 2,113,068 Foreign 46,108 45,836 42,483 Total $ 3,539,570 $ 2,957,951 $ 2,155,551

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 2013 Other current and noncurrent assets $ (3,631 ) $ 8,066 $ 1,186 Accrued salaries, benefits and payroll taxes (12,303 ) 10,136 (4,276 ) Accrued insurance and other taxes 4,425 (17,641 ) 421 Accrued income taxes (4,364 ) 27,680 3,889 Accrued pension, postretirement and postemployment benefits (18,153 ) 1,150 (4,795 ) Other current and noncurrent liabilities (3,014 ) (10,681 ) 7,373 Change in other assets and liabilities $ (37,040 ) $ 18,710 $ 3,798 The change in accrued salaries, benefits and payroll taxes in 2015 and 2014 was attributable to TXI-related severance accrual of $11,444,000 during 2014 and payments of $9,682,000 in 2015. The change in accrued pension, postretirement, and postemployment benefits in 2015 was attributable to higher pension plan funding, which increased $28,270,000. The change in accrued income taxes was primarily attributable to a reduction in the Corporation’s tax liability due to the utilization of net operating loss carryforwards, and the receipt of the federal tax refunds attributable to the settlement of the U.S. Advanced Pricing Agreement. Noncash investing and financing activities are as follows: years ended December 31 (add 000) 2015 2014 2013 Noncash investing and financing activities: Acquisition of assets through asset exchange $ 5,000 $ 2,091 $ — Acquisition of assets through capital lease $ 1,445 $ 7,788 $ 10,341 Seller financing of land purchase $ — $ 1,500 $ — Acquisition of TXI net assets assumed through issuances of common stock and options $ — $ 2,691,986 $ —

SCHEDULE II - Valuation and Qua

SCHEDULE II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2015
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, 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 - 1,103 (b) 426 (a) 1486 Inventory valuation allowance 99,026 11,762 9,942 (c) 1,541 (d) 119,189 Year ended December 31, 2013 Allowance for doubtful accounts $ 6,069 $ - $ - $ 1,988 (a) $ 4,081 Allowance for uncollectible notes receivable 440 369 - - 809 Inventory valuation allowance 96,817 1,165 1,044 (c) - 99,026 (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, 2015
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 accounted for 55% of consolidated 2015 net sales and 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 (which accounted for 27% of consolidated 2015 net sales), are sold and shipped from a network of more than 400 quarries, distribution facilities and plants to customers in 36 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, 2015, 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 70% of the Aggregates business’ 2015 net sales: Texas, Colorado, North Carolina, Iowa and Georgia. The Cement segment, accounting for 11% of consolidated 2015 net sales, produces Portland and specialty cements. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. Texas and California accounted for 72% and 25%, respectively, of the Cement business’ 2015 net sales. In September 2015, the Corporation divested of its California cement operations. The Magnesia Specialties segment, accounting for 7% of consolidated 2015 net sales, 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 best estimates and judgment. Management evaluates its 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 of these estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these 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.
Early Adoption of New Accounting Standard	Early Adoption of New Accounting Standard. Effective December 31, 2015, the Corporation early adopted the Financial Accounting Standard Board’s (the “FASB”) final guidance on the balance sheet classification of deferred taxes. The guidance requires deferred tax assets and liabilities to be classified as noncurrent rather than split between current and noncurrent; however, deferred tax assets and liabilities from different federal, state and foreign jurisdictions are not netted for financial statement presentation. The adoption of Accounting Standards Update 2015-17, Balance Sheet Classification of Deferred Taxes, had no impact on the Corporation’s consolidated shareholders’ equity, results of operations or cash flows. Retrospective application is allowed and $244,638,000 of current deferred tax assets was reclassed into deferred income taxes, net, on the consolidated balance sheet as of December 31, 2014 to conform with current year presentation.
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 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 for interim and annual reporting periods beginning after December 31, 2017 and can be applied on a full retrospective or modified retrospective approach. The Corporation is currently evaluating the impact of the provisions of the new standard, and at this time does not expect the impact to be material to its results of operations.
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 Corporation’s 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 that short-term operating cash needs are met and that excess funds are managed efficiently. The Corporation subsidizes shortages in operating cash through short-term borrowing facilities. The Corporation utilizes excess cash to either pay down short-term 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 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 its 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 that 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 based on the amount in excess of 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 Corporation uses the accelerated expense recognition method for stock options. 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 expenses the fair value of restricted stock awards, incentive compensation awards and Board of Directors’ fees paid in the form of common stock based on the closing price of the Corporation’s common stock on the awards’ respective grant dates. 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, 2014 and 2013 were: 2015 2014 2013 Risk-free interest rate 2.20% 2.50% 1.70% Dividend yield 1.20% 1.50% 1.80% Volatility factor 36.10% 35.30% 35.40% Expected term 8.5 years 8.5 years 8.6 years Based on these assumptions, the weighted-average fair value of each stock option granted was $57.71, $43.42 and $36.48 for 2015, 2014 and 2013, 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. 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.
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 estimate of 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 tax, 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. 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. Because of 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 construction contracts carry longer warranty periods, ranging from two to ten years, 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, 2015, 2014 and 2013.
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) 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 (loss) earnings, 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 2013 Accumulated other comprehensive (loss) earnings at beginning of period $ (108,189 ) $ 6,157 $ (4,137 ) $ (106,169 ) Other comprehensive earnings (loss) before reclassifications, net of tax 55,403 (2,255 ) — 53,148 Amounts reclassified from accumulated other comprehensive loss, net of tax 8,237 — 670 8,907 Other comprehensive earnings (loss), net of tax 63,640 (2,255 ) 670 62,055 Accumulated other comprehensive (loss) earnings at end of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Cumulative noncurrent deferred tax assets at end of period $ 29,198 $ — $ 2,269 $ 31,467 Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2015 2014 2013 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 2,085 $ — $ — Settlement charge — — 729 Amortization of: Prior service credit (1,880 ) (2,810 ) (2,807 ) Actuarial loss 16,850 3,779 15,704 17,055 969 13,626 Cost of sales; Selling, general & administrative expenses Tax effect (6,631 ) (382 ) (5,389 ) Taxes on income Total $ 10,424 $ 587 $ 8,237 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,280 $ 1,188 $ 1,108 Interest expense Tax effect (509 ) (470 ) (438 ) Taxes on income Total $ 771 $ 718 $ 670
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, 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. 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) 2015 2014 2013 Net earnings from continuing operations attributable to Martin Marietta $ 288,792 $ 155,638 $ 122,086 Less: Distributed and undistributed earnings attributable to unvested awards 1,252 647 513 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 287,540 154,991 121,573 Basic and diluted net loss attributable to common shareholders from discontinued operations — (37 ) (749 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 287,540 $ 154,954 $ 120,824 Basic weighted-average common shares outstanding 66,770 56,854 46,164 Effect of dilutive employee and director awards 250 234 121 Diluted weighted-average common shares outstanding 67,020 57,088 46,285
Reclassification	Reclassifications. Effective January 1, 2014, the Corporation reorganized the operations and management reporting structure of the Aggregates business, resulting in a change to the reportable segments. Segment information for 2013 has been reclassified to conform to the presentation of the current reportable segments.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
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	Key assumptions used in determining the fair value of the stock options awarded in 2015, 2014 and 2013 were: 2015 2014 2013 Risk-free interest rate 2.20% 2.50% 1.70% Dividend yield 1.20% 1.50% 1.80% Volatility factor 36.10% 35.30% 35.40% Expected term 8.5 years 8.5 years 8.6 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) 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 (loss) earnings, 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 2013 Accumulated other comprehensive (loss) earnings at beginning of period $ (108,189 ) $ 6,157 $ (4,137 ) $ (106,169 ) Other comprehensive earnings (loss) before reclassifications, net of tax 55,403 (2,255 ) — 53,148 Amounts reclassified from accumulated other comprehensive loss, net of tax 8,237 — 670 8,907 Other comprehensive earnings (loss), net of tax 63,640 (2,255 ) 670 62,055 Accumulated other comprehensive (loss) earnings at end of period $ (44,549 ) $ 3,902 $ (3,467 ) $ (44,114 ) Cumulative noncurrent deferred tax assets at end of period $ 29,198 $ — $ 2,269 $ 31,467
Reclassification Out of Accumulated Other Comprehensive Loss	Reclassifications out of accumulated other comprehensive loss are as follows: years ended December 31 (add 000) 2015 2014 2013 Affected line items in the consolidated statements of earnings Pension and postretirement benefit plans Special plan termination benefits $ 2,085 $ — $ — Settlement charge — — 729 Amortization of: Prior service credit (1,880 ) (2,810 ) (2,807 ) Actuarial loss 16,850 3,779 15,704 17,055 969 13,626 Cost of sales; Selling, general & administrative expenses Tax effect (6,631 ) (382 ) (5,389 ) Taxes on income Total $ 10,424 $ 587 $ 8,237 Unamortized value of terminated forward starting interest rate swap Additional interest expense $ 1,280 $ 1,188 $ 1,108 Interest expense Tax effect (509 ) (470 ) (438 ) Taxes on income Total $ 771 $ 718 $ 670
Basic and Diluted Earnings (Loss) 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) 2015 2014 2013 Net earnings from continuing operations attributable to Martin Marietta $ 288,792 $ 155,638 $ 122,086 Less: Distributed and undistributed earnings attributable to unvested awards 1,252 647 513 Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta 287,540 154,991 121,573 Basic and diluted net loss attributable to common shareholders from discontinued operations — (37 ) (749 ) Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta $ 287,540 $ 154,954 $ 120,824 Basic weighted-average common shares outstanding 66,770 56,854 46,164 Effect of dilutive employee and director awards 250 234 121 Diluted weighted-average common shares outstanding 67,020 57,088 46,285

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
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) 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 2014 Balance at beginning of period $ 263,967 $ 50,346 $ 302,308 $ — $ 616,621 Division reorganization 18,150 — (18,150 ) — — Acquisitions — — 600,372 883,900 1,484,272 Divestitures — — (32,094 ) — (32,094 ) Balance at end of period $ 282,117 $ 50,346 $ 852,436 $ 883,900 $ 2,068,799
Intangible Assets Subject to Amortization	Intangible assets subject to amortization consist of the following: December 31 Gross Amount Accumulated Amortization Net Balance (add 000) 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 2014 Noncompetition agreements $ 6,274 $ (5,971 ) $ 303 Customer relationships 36,610 (7,654 ) 28,956 Operating permits 498,462 (5,575 ) 492,887 Use rights and other 15,385 (6,940 ) 8,445 Trade names 12,800 (1,143 ) 11,657 Total $ 569,531 $ (27,283 ) $ 542,248
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) 2015 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 10,175 9,137 — 19,312 Trade names — 280 2,565 2,845 Total $ 16,775 $ 9,417 $ 2,565 $ 28,757 2014 Operating permits $ 6,600 $ — $ — $ 6,600 Use rights 9,975 19,437 — 29,412 Trade names — 14,380 2,565 16,945 Total $ 16,575 $ 33,817 $ 2,565 $ 52,957
Schedule of Acquired Intangibles	During 2015, the Corporation acquired $2,953,000 of intangibles, consisting of the following: (add 000, except year data) Amount Weighted-average amortization period Subject to amortization: Customer relationships $ 375 13.3 years Operating permits 1,017 26.5 years Use rights and other 1,361 22.1 years 2,753 22.5 years Not subject to amortization: Use rights 200 N/A 200 Total $ 2,953
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) 2016 $ 13,431 2017 13,345 2018 12,557 2019 11,665 2020 11,630 Thereafter 419,167 Total $ 481,795

Business Combinations and Div31

Business Combinations and Divestitures (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Pro Forma Financial Information	The pro forma financial information presented below is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place as of January 1, 2013. year ended December 31 (add 000) 2014 Net Sales $ 3,088,642 Earnings from continuing operations attributable to controlling interests $ 171,822

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Schedule of Accounts Receivable Net	(add 000) 2015 2014 Customer receivables $ 408,551 $ 418,016 Other current receivables 9,310 7,062 417,861 425,078 Less allowances (6,940 ) (4,077 ) Total $ 410,921 $ 421,001

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Inventories Net	December 31 (add 000) 2015 2014 Finished products $ 433,649 $ 413,766 Products in process and raw materials 55,194 65,250 Supplies and expendable parts 110,882 125,092 599,725 604,108 Less allowances (130,584 ) (119,189 ) Total $ 469,141 $ 484,919

Property, Plant and Equipment34

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	December 31 (add 000) 2015 2014 Land and land improvements $ 865,700 $ 849,704 Mineral reserves and interests 1,001,295 990,438 Buildings 144,076 157,233 Machinery and equipment 3,473,826 3,568,342 Construction in progress 128,301 125,959 5,613,198 5,691,676 Less allowances for depreciation, depletion and amortization (2,457,198 ) (2,288,906 ) Total $ 3,156,000 $ 3,402,770
Gross Asset Value and Related Allowance for Amortization for Machinery and Equipment Recorded under Capital Lease	The gross asset value and related allowance for amortization for machinery and equipment recorded under capital leases at December 31 were as follows: (add 000) 2015 2014 Machinery and equipment under capital leases $ 19,379 $ 25,775 Less allowance for amortization (5,102 ) (2,808 ) Total $ 14,277 $ 22,967

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	December 31 (add 000) 2015 2014 6.6% Senior Notes, due 2018 $ 299,368 $ 299,123 7% Debentures, due 2025 124,532 124,500 6.25% Senior Notes, due 2037 228,223 228,184 4.25% Senior Notes, due 2024 395,717 395,309 Floating Rate Notes, due 2017, interest rate of 1.71% and 1.33% at December 31, 2015 and 2014, respectively 299,318 298,869 Term Loan Facility, due 2018, interest rate of 1.86% and 1.67% at December 31, 2015 and 2014, respectively 224,075 236,258 Other notes 1,662 3,152 Total 1,572,895 1,585,395 Less current maturities (19,246 ) (14,336 ) Long-term debt $ 1,553,649 $ 1,571,059
Schedule Principal Amount, Effective Interest Rate and Maturity Date of Debentures and 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 LIBOR+1.10% June 30, 2017
Commitments Amounts Under Senior Unsecured Credit Facilities	Lender (add 000) Revolving Facility Commitment Term Loan Facility Commitment JPMorgan Chase Bank, N.A. $ 46,667 $ 33,333 Wells Fargo Bank, N.A. 46,667 33,333 BB&T 46,667 33,333 SunTrust Bank 46,667 33,333 Deutsche Bank AG New York Branch 46,667 33,333 PNC Bank, National Association 29,167 20,833 Regions Bank 29,167 20,833 The Northern Trust Company 29,167 20,833 Comerica Bank 14,582 10,418 The Bank of Tokyo-Mitsubishi UFJ, Ltd. 14,582 10,418 Total $ 350,000 $ 250,000
Corporation's Long-Term Debt Maturities	The Corporation’s long-term debt maturities for the five years following December 31, 2015, and thereafter are: (add 000) 2016 $ 19,246 2017 318,028 2018 486,843 2019 90 2020 60 Thereafter 748,628 Total $ 1,572,895

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 2013 Federal income taxes: Current $ 20,627 $ 35,313 $ 30,856 Deferred 85,295 46,616 8,399 Total federal income taxes 105,922 81,929 39,255 State income taxes: Current 18,153 10,307 3,201 Deferred 930 3,376 478 Total state income taxes 19,083 13,683 3,679 Foreign income taxes: Current 99 1,262 972 Deferred (241 ) (2,027 ) 139 Total foreign income taxes (142 ) (765 ) 1,111 Total taxes on income $ 124,863 $ 94,847 $ 44,045
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 2015 2014 2013 Statutory tax rate 35.0 % 35.0 % 35.0 % (Reduction) increase resulting from: Effect of statutory depletion (7.8 ) (9.6 ) (12.0 ) State income taxes 3.0 3.6 1.5 Domestic production deduction (0.1 ) (0.9 ) (2.1 ) Transfer pricing — (0.2 ) 0.9 Goodwill write off 0.4 3.9 — Foreign tax rate differential — 1.3 2.1 Disallowed compensation 0.2 3.7 0.3 Purchase accounting transaction costs — 2.4 — Other items (0.5 ) (1.1 ) 1.1 Effective income tax rate 30.2 % 38.1 % 26.8 %
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) 2015 2014 Deferred tax assets related to: Employee benefits $ 56,302 $ 74,288 Inventories 75,907 64,484 Valuation and other reserves 42,857 48,278 Net operating loss carryforwards 11,448 171,781 Accumulated other comprehensive loss 67,757 70,367 Alternative Minimum Tax credit carryforward 48,197 28,809 Gross deferred tax assets 302,468 458,007 Valuation allowance on deferred tax assets (8,967 ) (6,133 ) Total net deferred tax assets 293,501 451,874 Deferred tax liabilities related to: Property, plant and equipment (593,767 ) (638,730 ) Goodwill and other intangibles (266,436 ) (288,471 ) Other items, net (16,757 ) (14,618 ) Total deferred tax liabilities (876,960 ) (941,819 ) Net deferred tax liability $ (583,459 ) $ (489,945 )
Schedule Of Unrecognized Tax Benefits	The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects: years ended December 31 (add 000) 2015 2014 2013 Unrecognized tax benefits at beginning of year $ 21,107 $ 11,826 $ 15,380 Gross increases – tax positions in prior years 3,079 2,075 9,845 Gross decreases – tax positions in prior years (3,512 ) (203 ) (5,121 ) Gross increases – tax positions in current year 4,978 3,369 2,540 Gross decreases – tax positions in current year (594 ) (51 ) (529 ) Settlements with taxing authorities — — (8,599 ) Lapse of statute of limitations (6,331 ) (1,872 ) (1,690 ) Unrecognized tax benefits assumed with acquisition — 5,963 — Unrecognized tax benefits at end of year $ 18,727 $ 21,107 $ 11,826

Retirement Plans, Postretirem37

Retirement Plans, Postretirement and Postemployment Benefits (Tables)	12 Months Ended
	Dec. 31, 2015
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) 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 High-yield bonds — — — — 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 2014 Equity securities: Mid-sized to large cap $ — $ 219,092 $ — $ 219,092 Small cap, international and emerging growth funds — 87,706 — 87,706 Debt securities: Core fixed income — 154,997 — 154,997 High-yield bonds — — — — Real estate — — 20,363 20,363 Hedge funds — — 38,264 38,264 Cash 3,620 — — 3,620 Total $ 3,620 $ 461,795 $ 58,627 $ 524,042
Schedule of Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates at December 31 are: 2015 2014 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 2020 2019
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 $ 55 $ (51 ) Postretirement benefit obligation $ 1,312 $ (1,133 )
Pension
Schedule of Components of Net Periodic Benefit Cost	The net periodic retirement benefit cost of defined benefit plans includes the following components: years ended December 31 (add 000) 2015 2014 2013 Components of net periodic benefit cost: Service cost $ 23,001 $ 17,125 $ 16,121 Interest cost 33,151 28,935 23,016 Expected return on assets (36,385 ) (32,661 ) (26,660 ) Amortization of: Prior service cost 422 445 449 Actuarial loss 17,159 4,045 15,679 Transition asset (1 ) (1 ) (1 ) Settlement charge — — 729 Termination benefit charge 2,085 13,652 — Net periodic benefit cost $ 39,432 $ 31,540 $ 29,333
Schedule of Recognized Comprehensive Earnings	The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2015 2014 2013 Actuarial loss (gain) $ 9,916 $ 105,546 $ (90,755 ) Amortization of: Prior service cost (422 ) (445 ) (449 ) Actuarial loss (17,159 ) (4,045 ) (15,679 ) Transition asset 1 1 1 Special plan termination benefits (2,085 ) — — Settlement charge — — (729 ) Net prior service cost 2,338 — — Total $ (7,411 ) $ 101,057 $ (107,611 )
Schedule of Net Periodic Benefit 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 2015 2014 (add 000) Gross Net of tax Gross Net of tax Prior service cost $ 1,028 $ 628 $ 1,197 $ 729 Actuarial loss 178,770 108,874 186,013 113,288 Transition asset (8 ) (5 ) (9 ) (5 ) Total $ 179,790 $ 109,497 $ 187,201 $ 114,012
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) 2015 2014 Change in projected benefit obligation: Net projected benefit obligation at beginning of year $ 753,975 $ 496,040 Service cost 23,001 17,125 Interest cost 33,151 28,935 Actuarial (gain) loss (27,119 ) 99,071 Gross benefits paid (30,803 ) (23,489 ) Acquisitions — 122,641 Nonrecurring termination benefit 2,338 13,652 Net projected benefit obligation at end of year $ 754,543 $ 753,975
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) 2015 2014 Change in plan assets: Fair value of plan assets at beginning of year $ 524,042 $ 443,973 Actual return on plan assets, net (651 ) 26,186 Employer contributions 53,924 25,654 Gross benefits paid (30,803 ) (23,489 ) Acquisitions — 51,718 Fair value of plan assets at end of year $ 546,512 $ 524,042
Schedule of Funded Status	years ended December 31 (add 000) 2015 2014 Funded status of the plan at end of year $ (208,031 ) $ (229,933 ) Accrued benefit cost $ (208,031 ) $ (229,933 )
Schedule of Amounts Recognized on Consolidated Balance Sheets	December 31 (add 000) 2015 2014 Amounts recognized on consolidated balance sheets consist of: Current liability $ (6,048 ) $ (4,183 ) Noncurrent liability (201,983 ) (225,750 ) Net amount recognized at end of year $ (208,031 ) $ (229,933 )
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) 2015 2014 Projected benefit obligation $ 754,543 $ 753,975 Accumulated benefit obligation $ 688,017 $ 684,647 Fair value of plan assets $ 546,512 $ 524,042
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine benefit obligations as of December 31 are: 2015 2014 Discount rate 4.67% 4.25% 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: 2015 2014 2013 Discount rate 4.25% 5.17% 4.24% Rate of increase in future compensation levels 4.50% 5.00% 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 2015 and the actual pension plan asset allocation by asset class are as follows: Percentage of Plan Assets 2015 December 31 Asset Class Target Allocation 2015 2014 Equity securities 54% 55% 59% Debt securities 30% 31% 29% Hedge funds 8% 7% 4% Real estate 8% 7% 7% Cash 0% 0% 1% 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) 2015 Balance at beginning of year $ 20,363 $ 38,264 Purchases, sales, settlements, net — — Actual return on plan assets held at period end 2,879 955 Balance at end of year $ 23,242 $ 39,219 2014 Balance at beginning of year $ 19,357 $ 21,764 Purchases, sales, settlements, net 441 15,600 Actual return on plan assets held at period end 565 900 Balance at end of year $ 20,363 $ 38,264
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) 2016 $ 34,226 2017 $ 36,301 2018 $ 38,105 2019 $ 40,327 2020 $ 42,582 Years 2021 - 2025 $ 238,610
Postretirement Benefits
Schedule of Components of Net Periodic Benefit Cost	The net periodic postretirement benefit (credit) cost of postretirement plans includes the following components: years ended December 31 (add 000) 2015 2014 2013 Components of net periodic benefit credit: Service cost $ 137 $ 206 $ 227 Interest cost 928 1,164 1,013 Amortization of: Prior service credit (2,302 ) (3,255 ) (3,255 ) Actuarial (gain) loss (309 ) (266 ) 25 Total net periodic benefit credit $ (1,546 ) $ (2,151 ) $ (1,990 )
Schedule of Recognized Comprehensive Earnings	The Corporation recognized the following amounts in consolidated comprehensive earnings: years ended December 31 (add 000) 2015 2014 2013 Actuarial gain $ (626 ) $ (3,026 ) $ (1,011 ) Amortization of: Prior service credit 2,302 3,255 3,255 Actuarial gain (loss) 309 266 (25 ) Total $ 1,985 $ 495 $ 2,219
Schedule of Net Periodic Benefit Cost Not Yet Recognized	Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost: 2015 2014 (add 000) Gross Net of tax Gross Net of tax Prior service credit $ (4,786 ) $ (2,924 ) $ (7,088 ) $ (4,316 ) Actuarial gain (5,050 ) (3,086 ) (4,733 ) (2,883 ) Total $ (9,836 ) $ (6,010 ) $ (11,821 ) $ (7,199 )
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) 2015 2014 Change in benefit obligation: Net benefit obligation at beginning of year $ 25,086 $ 27,352 Service cost 137 206 Interest cost 928 1,164 Participants’ contributions 1,777 2,100 Actuarial gain (627 ) (3,026 ) Gross benefits paid (3,893 ) (4,856 ) Acquisitions — 2,146 Net benefit obligation at end of year $ 23,408 $ 25,086
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) 2015 2014 Change in plan assets: Fair value of plan assets at beginning of year $ — $ — Employer contributions 2,116 2,756 Participants’ contributions 1,777 2,100 Gross benefits paid (3,893 ) (4,856 ) Fair value of plan assets at end of year $ — $ —
Schedule of Funded Status	December 31 (add 000) 2015 2014 Funded status of the plan at end of year $ (23,408 ) $ (25,086 ) Accrued benefit cost $ (23,408 ) $ (25,086 )
Schedule of Amounts Recognized on Consolidated Balance Sheets	December 31 (add 000) 2015 2014 Amounts recognized on consolidated balance sheets consist of: Current liability $ (2,120 ) $ (2,770 ) Noncurrent liability (21,288 ) (22,316 ) Net amount recognized at end of year $ (23,408 ) $ (25,086 )
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are: 2015 2014 Discount rate 4.25 % 3.83 % Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are: 2015 2014 2013 Discount rate 3.83 % 4.42 % 3.54 %
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) 2016 $ 2,120 2017 $ 2,344 2018 $ 2,275 2019 $ 2,159 2020 $ 2,051 Years 2021 - 2025 $ 9,170

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary Information for Stock Options	The following table includes summary information for stock options as of December 31, 2015: Number of Options Weighted- Average Exercise Price Weighted-Average Remaining Contractual Life (years) Outstanding at January 1, 2015 1,054,435 $ 96.53 Granted 55,244 $ 154.58 Exercised (367,497 ) $ 101.31 Terminated (56,170 ) $ 135.85 Outstanding at December 31, 2015 686,012 $ 95.43 3.8 Exercisable at December 31, 2015 544,755 $ 87.75 2.7
Summary of Information for Incentive Compensation Awards and Restricted Stock Awards	The following table summarizes information for incentive compensation awards and restricted stock awards as of December 31, 2015: Incentive Compensation Restricted Stock - Service Based Restricted Stock - Performance Based 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, 2015 27,608 $ 101.61 319,230 $ 105.62 16,388 $ 129.14 Awarded 22,035 $ 108.53 48,368 $ 154.26 20,219 $ 108.53 Distributed (11,751 ) $ 99.14 (75,411 ) $ 77.27 — $ — Forfeited (552 ) $ 102.99 (3,624 ) $ 127.06 — $ — December 31, 2015 37,340 $ 106.45 288,563 $ 120.92 36,607 $ 117.76
Schedule of Stock-Based Compensation Expense	The following table summarizes stock-based compensation expense for the years ended December 31, 2015, 2014 and 2013, unrecognized compensation cost for nonvested awards at December 31, 2015 and the weighted-average period over which unrecognized compensation cost is expected to 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: 2015 $ 2,679 $ 9,809 $ 376 $ 725 $ 13,589 2014 $ 2,020 $ 6,189 $ 257 $ 527 8,993 2013 $ 1,734 $ 4,377 $ 229 $ 668 7,008 Unrecognized compensation cost at December 31, 2015: $ 2,718 $ 18,985 $ 334 $ — $ 22,037 Weighted-average period over which unrecognized compensation cost will be recognized: 2.0 years 2.8 years 1.5 years —
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2015: (add 000) 2016 $ 9,818 2017 6,578 2018 3,817 2019 1,824 2020 — Total $ 22,037

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Future Minimum Commitments under Capital Leases	Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2015 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2016 $ 3,166 $ 111,317 2017 2,922 73,106 2018 2,981 55,047 2019 2,691 45,940 2020 1,891 43,692 Thereafter 3,997 272,066 Total 17,648 $ 601,168 Less: imputed interest (2,724 ) Present value of minimum lease payments 14,924 Less: current capital lease obligations (2,438 ) Long-term capital lease obligations $ 12,486
Future Minimum Commitments under Operating Leases	Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2015 are as follows: (add 000) Capital Leases Operating Leases & Royalty Commitments 2016 $ 3,166 $ 111,317 2017 2,922 73,106 2018 2,981 55,047 2019 2,691 45,940 2020 1,891 43,692 Thereafter 3,997 272,066 Total 17,648 $ 601,168 Less: imputed interest (2,724 ) Present value of minimum lease payments 14,924 Less: current capital lease obligations (2,438 ) Long-term capital lease obligations $ 12,486

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 Balance at beginning of year $ 70,422 $ 48,727 Accretion expense 3,336 2,818 Liabilities incurred and assumed in business combinations 14,735 20,984 Liabilities settled (4,490 ) (2,061 ) Revisions in estimated cash flows 5,601 (46 ) Balance at end of year $ 89,604 $ 70,422
Schedule of Contractual Purchase Commitments	The Corporation’s contractual purchase commitments as of December 31, 2015 are as follows: (add 000) 2016 $ 155,525 2017 6,457 2018 1,361 2019 451 2020 451 Thereafter 1,575 Total $ 165,820

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2015
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 2015 2014 2013 Mid-America Group $ 926,251 $ 848,855 $ 789,806 Southeast Group 304,472 274,352 245,340 West Group 1,675,021 1,356,283 875,588 Total Aggregates Business 2,905,744 2,479,490 1,910,734 Cement 387,947 221,759 — Magnesia Specialties 245,879 256,702 244,817 Total $ 3,539,570 $ 2,957,951 $ 2,155,551 Net sales Mid-America Group $ 851,854 $ 770,568 $ 720,007 Southeast Group 285,302 254,986 226,437 West Group 1,535,848 1,207,879 771,133 Total Aggregates Business 2,673,004 2,233,433 1,717,577 Cement 367,604 209,556 — Magnesia Specialties 227,508 236,106 225,641 Total $ 3,268,116 $ 2,679,095 $ 1,943,218 Gross profit (loss) Mid-America Group $ 256,586 $ 216,883 $ 192,747 Southeast Group 34,197 10,653 (3,515 ) West Group 254,946 155,678 92,513 Total Aggregates Business 545,729 383,214 281,745 Cement 103,473 52,469 — Magnesia Specialties 78,732 84,594 83,703 Corporate (6,167 ) 2,083 (1,491 ) Total $ 721,767 $ 522,360 $ 363,957 years ended December 31 (add 000) Selling, general and administrative expenses 2015 2014 2013 Mid-America Group $ 52,606 $ 52,217 $ 53,683 Southeast Group 18,467 17,788 18,081 West Group 66,639 50,147 42,929 Total Aggregates Business 137,712 120,152 114,693 Cement 26,626 12,741 — Magnesia Specialties 9,499 9,776 10,165 Corporate 44,397 26,576 25,233 Total $ 218,234 $ 169,245 $ 150,091 Earnings (Loss) from operations Mid-America Group $ 206,820 $ 172,208 $ 144,269 Southeast Group 16,435 (5,293 ) (19,849 ) West Group 205,699 153,182 53,150 Total Aggregates Business 428,954 320,097 177,570 Cement 47,821 40,751 — Magnesia Specialties 68,886 74,805 73,506 Corporate (66,245 ) (120,780 ) (33,088 ) Total $ 479,416 $ 314,873 $ 217,988 Cement intersegment sales, which were to the ready mixed concrete product line in the West Group, were $87,782,000 for the year ended December 31, 2015 and $43,356,000 for the six months ended December 31, 2014. The Cement business was acquired July 1, 2014. years ended December 31 (add 000) Assets employed 2015 2014 2013 Mid-America Group $ 1,304,574 $ 1,290,833 $ 1,242,395 Southeast Group 583,369 604,044 611,906 West Group 2,621,636 2,444,400 1,030,599 Total Aggregates Business 4,509,579 4,339,277 2,884,900 Cement 1,939,796 2,451,799 — Magnesia Specialties 147,795 150,359 154,024 Corporate 364,562 278,319 146,081 Total $ 6,961,732 $ 7,219,754 $ 3,185,005 Depreciation, depletion and amortization Mid-America Group $ 61,693 $ 63,294 $ 66,381 Southeast Group 31,644 31,955 32,556 West Group 93,947 74,283 56,004 Total Aggregates Business 187,284 169,532 154,941 Cement 53,672 30,620 — Magnesia Specialties 13,769 10,394 10,564 Corporate 8,862 12,200 8,256 Total $ 263,587 $ 222,746 $ 173,761 years ended December 31 (add 000) Total property additions 2015 2014 2013 Mid-America Group $ 77,640 $ 76,753 $ 82,667 Southeast Group 12,155 23,326 72,907 West Group 235,245 753,342 53,530 Total Aggregates Business 325,040 853,421 209,104 Cement 9,599 975,063 — Magnesia Specialties 8,916 2,588 4,700 Corporate 20,561 15,349 6,477 Total $ 364,116 $ 1,846,421 $ 220,281 Property additions through acquisitions Mid-America Group $ 4,385 $ — $ 244 Southeast Group — — 54,463 West Group 35,965 632,560 — Total Aggregates Business 40,350 632,560 54,707 Cement — 970,300 — Magnesia Specialties — — — Corporate — — — Total $ 40,350 $ 1,602,860 $ 54,707
Net Sales By Product Line	The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include the asphalt, ready mixed concrete and road paving 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. years ended December 31 (add 000) Total revenues 2015 2014 2013 Aggregates $ 2,017,761 $ 1,805,824 $ 1,527,986 Asphalt 72,282 85,822 78,863 Ready Mixed Concrete 657,088 431,229 146,085 Road Paving 158,613 156,615 157,800 Total Aggregates Business 2,905,744 2,479,490 1,910,734 Cement 387,947 221,759 — Magnesia Specialties 245,879 256,702 244,817 Total $ 3,539,570 $ 2,957,951 $ 2,155,551 Net sales Aggregates $ 1,793,660 $ 1,570,022 $ 1,347,486 Asphalt 64,943 76,278 66,216 Ready Mixed Concrete 655,788 430,519 146,079 Road Paving 158,613 156,614 157,796 Total Aggregates Business 2,673,004 2,233,433 1,717,577 Cement 367,604 209,556 — Magnesia Specialties 227,508 236,106 225,641 Total $ 3,268,116 $ 2,679,095 $ 1,943,218 Gross profit (loss) 2015 2014 2013 Aggregates $ 467,053 $ 324,093 $ 259,054 Asphalt 18,189 13,552 12,928 Ready Mixed Concrete 42,942 39,129 8,337 Road Paving 17,545 6,440 1,426 Total Aggregates Business 545,729 383,214 281,745 Cement 103,473 52,469 — Magnesia Specialties 78,732 84,594 83,703 Corporate (6,167 ) 2,083 (1,491 ) Total $ 721,767 $ 522,360 $ 363,957
Domestic and Foreign Total Revenues	Domestic and foreign total revenues are as follows: years ended December 31 (add 000) 2015 2014 2013 Domestic $ 3,493,462 $ 2,912,115 $ 2,113,068 Foreign 46,108 45,836 42,483 Total $ 3,539,570 $ 2,957,951 $ 2,155,551

Supplemental Cash Flow Inform42

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2015
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) 2015 2014 2013 Other current and noncurrent assets $ (3,631 ) $ 8,066 $ 1,186 Accrued salaries, benefits and payroll taxes (12,303 ) 10,136 (4,276 ) Accrued insurance and other taxes 4,425 (17,641 ) 421 Accrued income taxes (4,364 ) 27,680 3,889 Accrued pension, postretirement and postemployment benefits (18,153 ) 1,150 (4,795 ) Other current and noncurrent liabilities (3,014 ) (10,681 ) 7,373 Change in other assets and liabilities $ (37,040 ) $ 18,710 $ 3,798
Schedule Of Noncash Investing and Financing Activities	Noncash investing and financing activities are as follows: years ended December 31 (add 000) 2015 2014 2013 Noncash investing and financing activities: Acquisition of assets through asset exchange $ 5,000 $ 2,091 $ — Acquisition of assets through capital lease $ 1,445 $ 7,788 $ 10,341 Seller financing of land purchase $ — $ 1,500 $ — Acquisition of TXI net assets assumed through issuances of common stock and options $ — $ 2,691,986 $ —

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)FacilityState$ / shares	Dec. 31, 2014USD ($)$ / shares	Dec. 31, 2013$ / 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	36
Current deferred tax assets reclassed into deferred income taxes, net		$ 244,638,000
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	$ 36.48
Minimum likelihood for recognition of tax benefit related to uncertain tax position	50.00%
Minimum
Significant Accounting Policies [Line Items]
Warranty term	9 months
Extended product warranty term	2 years
Maximum
Significant Accounting Policies [Line Items]
Warranty term	1 year
Extended product warranty term	10 years
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
Aggregates Product Line | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	55.00%
Aggregates-Related Downstream Product Lines | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	27.00%
Cement | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	11.00%
Magnesia Specialties | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	7.00%
Percentage of Aggregates Business Net Sales in Top Five Sales states | Geographic Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	70.00%
Texas | Cement | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	72.00%
California | Cement | Product Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	25.00%

Estimated Service Lives of Prop

Estimated Service Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2015
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

Fair Value of Stock Option Awar

Fair Value of Stock Option Awarded (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	2.20%	2.50%	1.70%
Dividend yield	1.20%	1.50%	1.80%
Volatility factor	36.10%	35.30%	35.40%
Expected term	8 years 6 months	8 years 6 months	8 years 7 months 6 days

Components of Changes in Accumu

Components of Changes in Accumulated Other Comprehensive Loss and Related Cumulative Noncurrent Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	$ (106,159)	$ (44,114)	$ (106,169)
Other comprehensive earnings (loss) before reclassifications, net of tax	(10,658)	(63,350)	53,148
Amounts reclassified from accumulated other comprehensive loss, net of tax	11,195	1,305	8,907
Other comprehensive earnings (loss), net of tax	537	(62,045)	62,055
Accumulated other comprehensive (loss) earnings at end of period	(105,622)	(106,159)	(44,114)
Cumulative noncurrent deferred tax assets at end of period	67,757	70,367	31,467
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	(106,688)	(44,549)	(108,189)
Other comprehensive earnings (loss) before reclassifications, net of tax	(7,116)	(62,726)	55,403
Amounts reclassified from accumulated other comprehensive loss, net of tax	10,424	587	8,237
Other comprehensive earnings (loss), net of tax	3,308	(62,139)	63,640
Accumulated other comprehensive (loss) earnings at end of period	(103,380)	(106,688)	(44,549)
Cumulative noncurrent deferred tax assets at end of period	66,467	68,568	29,198
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	3,278	3,902	6,157
Other comprehensive earnings (loss) before reclassifications, net of tax	(3,542)	(624)	(2,255)
Other comprehensive earnings (loss), net of tax	(3,542)	(624)	(2,255)
Accumulated other comprehensive (loss) earnings at end of period	(264)	3,278	3,902
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	(2,749)	(3,467)	(4,137)
Amounts reclassified from accumulated other comprehensive loss, net of tax	771	718	670
Other comprehensive earnings (loss), net of tax	771	718	670
Accumulated other comprehensive (loss) earnings at end of period	(1,978)	(2,749)	(3,467)
Cumulative noncurrent deferred tax assets at end of period	$ 1,290	$ 1,799	$ 2,269

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 76,287	$ 66,057	$ 53,467
Earnings from Continuing Operations	(11,195)	(1,305)	(8,907)
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	(10,424)	(587)	(8,237)
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	(771)	(718)	(670)
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	2,085
Settlement charge			729
Prior service credit	(1,880)	(2,810)	(2,807)
Actuarial loss	16,850	3,779	15,704
Tax effect	(6,631)	(382)	(5,389)
Earnings from Continuing Operations	10,424	587	8,237
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	17,055	969	13,626
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]
Interest expense	1,280	1,188	1,108
Tax effect	(509)	(470)	(438)
Earnings from Continuing Operations	$ 771	$ 718	$ 670

Basic and Diluted Earnings Per

Basic and Diluted Earnings Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net earnings from continuing operations attributable to Martin Marietta	$ 288,792	$ 155,638	$ 122,086
Less: Distributed and undistributed earnings attributable to unvested awards	1,252	647	513
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta	287,540	154,991	121,573
Basic and diluted net loss attributable to common shareholders from discontinued operations		(37)	(749)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$ 287,540	$ 154,954	$ 120,824
Basic weighted-average common shares outstanding	66,770	56,854	46,164
Effect of dilutive employee and director awards	250	234	121
Diluted weighted-average common shares outstanding	67,020	57,088	46,285

Changes in Goodwill (Detail)

Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Balance at beginning of period	$ 2,068,799	$ 616,621
Acquisitions	8,464	1,484,272
Adjustments to purchase price allocations	(3,096)
Divestitures	(5,932)	(32,094)
Balance at end of period	2,068,235	2,068,799
Mid-America Group
Goodwill [Line Items]
Balance at beginning of period	282,117	263,967
Division reorganization		18,150
Divestitures	(714)
Balance at end of period	281,403	282,117
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	852,436	302,308
Division reorganization		(18,150)
Acquisitions	8,464	600,372
Adjustments to purchase price allocations	15,538
Divestitures	(5,218)	(32,094)
Balance at end of period	871,220	852,436
Cement
Goodwill [Line Items]
Balance at beginning of period	883,900
Acquisitions		883,900
Adjustments to purchase price allocations	(18,634)
Balance at end of period	$ 865,266	$ 883,900

Intangible Assets Subject to Am

Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 522,044	$ 569,531
Accumulated Amortization	(40,249)	(27,283)
Net Balance	481,795	542,248
Noncompetition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	6,274	6,274
Accumulated Amortization	(6,069)	(5,971)
Net Balance	205	303
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	35,805	36,610
Accumulated Amortization	(10,448)	(7,654)
Net Balance	25,357	28,956
Operating Permits
Finite-Lived Intangible Assets [Line Items]
Gross Amount	450,419	498,462
Accumulated Amortization	(12,294)	(5,575)
Net Balance	438,125	492,887
Use Rights And Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	16,746	15,385
Accumulated Amortization	(8,030)	(6,940)
Net Balance	8,716	8,445
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,800	12,800
Accumulated Amortization	(3,408)	(1,143)
Net Balance	$ 9,392	$ 11,657

Intangible Assets Deemed to Ind

Intangible Assets Deemed to Indefinite Life and Not Being Amortized (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 28,757	$ 52,957
Aggregates Business
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	16,775	16,575
Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	9,417	33,817
Magnesia Specialties
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2,565	2,565
Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	6,600	6,600
Operating Permits | Aggregates Business
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	19,312	29,412
Use Rights Not Subject To Amortization | Aggregates Business
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	10,175	9,975
Use Rights Not Subject To Amortization | Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	9,137	19,437
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2,845	16,945
Trade names | Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	280	14,380
Trade names | Magnesia Specialties
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 2,565	$ 2,565

Goodwill and Intangible Asset52

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Other intangibles acquired	$ 2,953
Amortization expense of intangible assets	$ 13,962	$ 9,311	$ 3,587

Schedule of Acquired Intangible

Schedule of Acquired Intangibles (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 2,753
Acquired Finite-lived Intangible Assets, Useful Life	22 years 6 months
Acquired intangibles not subject to amortization	$ 200
Acquired Intangibles, total	2,953
Customer Relationships
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 375
Acquired Finite-lived Intangible Assets, Useful Life	13 years 3 months 18 days
Operating Permits
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 1,017
Acquired Finite-lived Intangible Assets, Useful Life	26 years 6 months
Use Rights And Other
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 1,361
Acquired Finite-lived Intangible Assets, Useful Life	22 years 1 month 6 days
Use Rights
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles not subject to amortization	$ 200

Estimated Amortization Expense

Estimated Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
2,016	$ 13,431
2,017	13,345
2,018	12,557
2,019	11,665
2,020	11,630
Thereafter	419,167
Net Balance	$ 481,795	$ 542,248

Business Combinations and Div55

Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2015USD ($)Terminal	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Business Combinations And Dispositions [Line Items]
Acquisition-related expenses, net		$ 8,464	$ 42,891	$ 671
California Cement Operations
Business Combinations And Dispositions [Line Items]
Description of discontinued operations		On September 30, 2015, the Corporation divested its California cement operations, which were reported in the Cement segment. These operations were not in close proximity to other core assets of the Corporation and, unlike other marketplace competitors, were not vertically integrated with ready mixed concrete production.
Number of distribution terminals | Terminal		2
Proceeds from sale of assets		$ 420,000
Gain (Loss) on disposition of assets		24,214
Disposal related expenses		$ 4,849
Texas Industries Inc.
Business Combinations And Dispositions [Line Items]
Acquisition date		Jul. 1, 2014
Total revenues from operations included in the consolidated statements of earnings	$ 539,061	$ 941,499
Total earnings from operations included in the consolidated statements of earnings	$ 42,239	70,121
Acquisition-related expenses, net		$ 6,762	$ 90,487

Pro Forma Financial Information

Pro Forma Financial Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Business Combinations [Abstract]
Net Sales	$ 3,088,642
Earnings from continuing operations attributable to controlling interests	$ 171,822

Accounts Receivable, Net (Detai

Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Customer receivables	$ 408,551	$ 418,016
Other current receivables	9,310	7,062
Accounts Receivable, gross	417,861	425,078
Less allowances	(6,940)	(4,077)
Total	$ 410,921	$ 421,001

Accounts Receivable, Net - Addi

Accounts Receivable, Net - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Due from unconsolidated affiliates	$ 3,794	$ 3,765

Inventories Net (Detail)

Inventories Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Finished products	$ 433,649	$ 413,766
Products in process and raw materials	55,194	65,250
Supplies and expendable parts	110,882	125,092
Inventories, Gross	599,725	604,108
Less allowances	(130,584)	(119,189)
Total	$ 469,141	$ 484,919

Property Plant and Equipment Ne

Property Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Land and land improvements	$ 865,700	$ 849,704
Mineral reserves and interests	1,001,295	990,438
Buildings	144,076	157,233
Machinery and equipment	3,473,826	3,568,342
Construction in progress	128,301	125,959
Gross property, plant and equipment	5,613,198	5,691,676
Less allowances for depreciation, depletion and amortization	(2,457,198)	(2,288,906)
Total	$ 3,156,000	$ 3,402,770

Gross Asset Value and Related A

Gross Asset Value and Related Allowance for Amortization for Machinery and Equipment Recorded under Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Machinery and equipment under capital leases	$ 19,379	$ 25,775
Less allowance for amortization	(5,102)	(2,808)
Total	$ 14,277	$ 22,967

Property, Plant and Equipment62

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Depreciation, depletion and amortization	$ 246,874	$ 211,242	$ 168,333
Capitalized interest cost	5,832	8,033	$ 1,792
Property, plant and equipment, net	3,156,000	3,402,770
Bahamas And Canada
Property Plant And Equipment [Line Items]
Property, plant and equipment, net	$ 58,937	$ 68,340

Long-Term Debt (Detail)

Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 1,572,895	$ 1,585,395
Less current maturities	(19,246)	(14,336)
Long-term debt	1,553,649	1,571,059
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Total debt	299,368	299,123
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	124,532	124,500
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228,223	228,184
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	395,717	395,309
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Total debt	299,318	298,869
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Total debt	224,075	236,258
Other Notes
Debt Instrument [Line Items]
Total debt	$ 1,662	$ 3,152

Long-Term Debt (Parenthetical)

Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity date	2,018
Interest rate on notes	6.60%
Interest rate	6.81%
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity date	2,025
Interest rate on notes	7.00%
Interest rate	7.12%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity date	2,037
Interest rate on notes	6.25%
Interest rate	6.45%
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Maturity date	2,024
Interest rate on notes	4.25%
Interest rate	4.25%
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date	2,017	2,017
Interest rate	1.71%	1.33%
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Maturity date	2,018	2,018
Interest rate	1.86%	1.67%

Long-Term Debt - Additional inf

Long-Term Debt - Additional information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 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	46,263,000
Additional interest expense	$ 1,280,000	$ 1,188,000	$ 1,108,000
New Term Loan Facility | 2015
Debt Instrument [Line Items]
Quarterly principal payment under under the term loan facility	1.25%
New Term Loan Facility | There After
Debt Instrument [Line Items]
Quarterly principal payment under under the term loan facility	1.875%
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 Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 350,000,000
Senior unsecured revolving facility, maturity period	5 years
Debt instrument maturity period	Nov. 29, 2018
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
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Interest rate on notes	6.60%
Maturity date	2,018
Senior notes	$ 300,000,000
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 date	2,025
Senior notes	$ 125,000,000
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Interest rate on notes	6.25%
Maturity date	2,037
Senior notes	$ 230,000,000
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest rate on notes	4.25%
Maturity date	2,024
Senior notes	$ 400,000,000
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date	2,017	2,017
Senior notes	$ 300,000,000
Floating Rate Notes, Due 2017 | Three-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
Term Loan Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 250,000,000
Amended | Maximum | Texas Industries Inc.
Debt Instrument [Line Items]
Amendment consolidated EBITDA		$ 95,000,000
Acquisition integration expenses		$ 70,000,000
Amended | Senior Notes Due Twenty Twenty | Texas Industries Inc.
Debt Instrument [Line Items]
Interest rate on notes		9.25%
Maturity date		2,020
Trade Receivable Facility
Debt Instrument [Line Items]
Debt instrument maturity period	Sep. 30, 2016
Eligible trade receivables	$ 364,419,000	$ 369,575,000
Credit facility borrowing base	282,258,000	$ 313,428,000
Trade Receivable Facility | Credit Agreement Amendment
Debt Instrument [Line Items]
Credit facility commitment	$ 250,000,000
Trade Receivable Facility | London Interbank Offered Rate(LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	0.70%

Principal Amount Effective Inte

Principal Amount Effective Interest Rate and Maturity Date for Debentures and Senior Notes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	1.71%	1.33%
Debt Instrument Effective Interest Rate	LIBOR+1.10%
Maturity Date	Jun. 30, 2017

Senior Unsecured Credit Facilit

Senior Unsecured Credit Facilities (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Term Loan Facility Commitment	$ 250,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	350,000,000
J P Morgan Chase Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
J P Morgan Chase Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Wells Fargo Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Wells Fargo Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
BB&T
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
BB&T | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Sun Trust Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Sun Trust Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Deutsche Bank AG New York Branch
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Deutsche Bank AG New York Branch | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
PNC Bank, National Association
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
PNC Bank, National Association | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
Regions Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
Regions Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
The Northern Trust Company
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
The Northern Trust Company | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
Comerica Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	10,418,000
Comerica Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	14,582,000
Bank Of Tokyo Mitsubishi UFJ Limited
Debt Instrument [Line Items]
Term Loan Facility Commitment	10,418,000
Bank Of Tokyo Mitsubishi UFJ Limited | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 14,582,000

Long-Term Debt Maturities (Deta

Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2,016	$ 19,246
2,017	318,028
2,018	486,843
2,019	90
2,020	60
Thereafter	748,628
Total debt	$ 1,572,895	$ 1,585,395

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,572,895	$ 1,585,395
Long-term debt, fair values	$ 1,625,193	$ 1,680,584

Components of Income Tax Expens

Components of Income Tax Expense Benefit from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal income taxes:
Current	$ 20,627	$ 35,313	$ 30,856
Deferred	85,295	46,616	8,399
Total federal income taxes	105,922	81,929	39,255
State income taxes:
Current	18,153	10,307	3,201
Deferred	930	3,376	478
Total state income taxes	19,083	13,683	3,679
Foreign income taxes:
Current	99	1,262	972
Deferred	(241)	(2,027)	139
Total foreign income taxes	(142)	(765)	1,111
Total taxes on income	$ 124,863	$ 94,847	$ 44,045

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Income tax benefit from NOL carry forwards utilized	$ 156,554,000	$ 16,940,000
Income tax benefits attributable to stock-based compensation	871,000	2,508,000	$ 2,368,000
Foreign pretax loss	$ 1,175,000	10,557,000	10,277,000
Tax deduction, percentage	9.00%
Increased net earnings	$ 222,000	$ 3,239,000	$ 3,979,000
Increased net earnings, per share	$ 0.01	$ 0.05	$ 0.09
Operating loss carryforwards, expiration dates	2,035
Deferred tax assets recognized	$ 11,448,000	$ 171,781,000
Deferred tax asset, valuation allowance	8,690,000	5,084,000
Domestic and foreign tax credits, valuation allowance	277,000	1,049,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	48,197,000	28,809,000
Deferred tax liabilities, goodwill	0
Undistributed net earnings	32,284,000
Unrecognized tax benefits that would impact effective tax rate	7,975,000	$ 9,362,000	$ 6,301,000
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years	$ 1,455,000
Expiration date of statute of limitations	2,011	2,010	2,009
Tax refund, Per share	$ 0.04	$ 0.01	$ 0.03
Tax refund	$ 2,364,000	$ 687,000	$ 1,368,000
Earliest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations	2,011
Open tax years	2,011
Latest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations	2,012
Open tax years	2,015
Canadian Subsidiary
Income Taxes [Line Items]
Unrecognized deferred tax liability	$ 1,815,000
Federal Tax Authority Member
Income Taxes [Line Items]
Operating loss carryforwards, amount	33,863,000	465,467,000
Domestic Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	273,251,000	710,163,000
Domestic and foreign tax credits, amount	$ 3,179,000	3,682,000
Domestic Tax Authority | Federal Tax Authority Member
Income Taxes [Line Items]
Domestic and foreign tax credits, expiration dates	2,025
State Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	$ 239,388,000	$ 244,696,000
Deferred tax asset, valuation allowance	$ 3,714,000
Domestic and foreign tax credits, expiration dates	2,018

Effective Income Tax Rate on Co

Effective Income Tax Rate on Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
Effect of statutory depletion	(7.80%)	(9.60%)	(12.00%)
State income taxes	3.00%	3.60%	1.50%
Domestic production deduction	(0.10%)	(0.90%)	(2.10%)
Transfer pricing		(0.20%)	0.90%
Goodwill write off	0.40%	3.90%
Foreign tax rate differential		1.30%	2.10%
Disallowed compensation	0.20%	3.70%	0.30%
Purchase accounting transaction costs		2.40%
Other items	(0.50%)	(1.10%)	1.10%
Effective income tax rate	30.20%	38.10%	26.80%

Components of Deferred Tax Asse

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets related to:
Employee benefits	$ 56,302	$ 74,288
Inventories	75,907	64,484
Valuation and other reserves	42,857	48,278
Net operating loss carryforwards	11,448	171,781
Cumulative noncurrent deferred tax assets at end of period	67,757	70,367	$ 31,467
Alternative Minimum Tax credit carryforward	48,197	28,809
Gross deferred tax assets	302,468	458,007
Valuation allowance on deferred tax assets	(8,967)	(6,133)
Total net deferred tax assets	293,501	451,874
Deferred tax liabilities related to:
Property, plant and equipment	(593,767)	(638,730)
Goodwill and other intangibles	(266,436)	(288,471)
Other items, net	(16,757)	(14,618)
Total deferred tax liabilities	(876,960)	(941,819)
Net deferred tax liability	$ (583,459)	$ (489,945)

Unrecognized Tax Benefits Exclu

Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 21,107	$ 11,826	$ 15,380
Gross increases – tax positions in prior years	3,079	2,075	9,845
Gross decreases – tax positions in prior years	(3,512)	(203)	(5,121)
Gross increases – tax positions in current year	4,978	3,369	2,540
Gross decreases – tax positions in current year	(594)	(51)	(529)
Settlements with taxing authorities			(8,599)
Lapse of statute of limitations	(6,331)	(1,872)	(1,690)
Unrecognized tax benefits assumed with acquisition		5,963
Unrecognized tax benefits at end of year	$ 18,727	$ 21,107	$ 11,826

Schedule of Components of Net P

Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 23,001	$ 17,125	$ 16,121
Interest cost	33,151	28,935	23,016
Expected return on assets	(36,385)	(32,661)	(26,660)
Prior service cost	422	445	449
Actuarial (gain) loss	17,159	4,045	15,679
Transition asset	(1)	(1)	(1)
Settlement charge			729
Termination benefit charge	2,085	13,652
Net periodic benefit cost	39,432	31,540	29,333
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	137	206	227
Interest cost	928	1,164	1,013
Prior service cost	(2,302)	(3,255)	(3,255)
Actuarial (gain) loss	(309)	(266)	25
Net periodic benefit cost	$ (1,546)	$ (2,151)	$ (1,990)

Net Periodic Benefit Cost Recog

Net Periodic Benefit Cost Recognized in Comprehensive Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	$ 9,916	$ 105,546	$ (90,755)
Prior service cost	(422)	(445)	(449)
Actuarial gain (loss)	(17,159)	(4,045)	(15,679)
Transition asset	1	1	1
Special plan termination benefits	(2,085)	(13,652)
Settlement charge			(729)
Net prior service cost	2,338
Total	(7,411)	101,057	(107,611)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	(626)	(3,026)	(1,011)
Prior service cost	2,302	3,255	3,255
Actuarial gain (loss)	309	266	(25)
Total	$ 1,985	$ 495	$ 2,219

Net Periodic Benefit Cost Not Y

Net Periodic Benefit Cost Not Yet Recognized (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Prior service cost - Gross	$ 1,028	$ 1,197
Actuarial gain - Gross	178,770	186,013
Transition asset - Gross	(8)	(9)
Total - Gross	179,790	187,201
Prior service cost - Net of tax	628	729
Actuarial gain - Net of tax	108,874	113,288
Transition asset - Net of tax	(5)	(5)
Total - Net of tax	109,497	114,012
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost - Gross	(4,786)	(7,088)
Actuarial gain - Gross	(5,050)	(4,733)
Total - Gross	(9,836)	(11,821)
Prior service cost - Net of tax	(2,924)	(4,316)
Actuarial gain - Net of tax	(3,086)	(2,883)
Total - Net of tax	$ (6,010)	$ (7,199)

Retirement Plans Postretirement

Retirement Plans Postretirement and Postemployment Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans	$ 688,017,000	$ 684,647,000
Pension and SERP contributions	53,924,000	25,654,000
Corporation's matching obligations	12,444,000	8,602,000	$ 7,097,000
Accrued postemployment benefits	$ 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	$ 350,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	136,000
Actuarial gain (loss), recognized in net periodic benefit cost	11,318,000
Actuarial gain (loss), recognized in net periodic benefit cost - deferred tax asset and liability	4,403,000
Transition assets, recognized in net periodic benefit cost	1,000
Pension and SERP contributions	53,924,000	25,654,000
SERP Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	29,927,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost, recognized in net periodic benefit cost	1,846,000
Actuarial gain (loss), recognized in net periodic benefit cost	382,000
Pension and SERP contributions	2,116,000	$ 2,756,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	718,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	149,000
Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	$ 2,120,000

Change in Projected Benefit Obl

Change in Projected Benefit Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligation at beginning of year	$ 753,975	$ 496,040
Service cost	23,001	17,125	$ 16,121
Interest cost	33,151	28,935	23,016
Actuarial (gain) loss	(27,119)	99,071
Gross benefits paid	(30,803)	(23,489)
Acquisitions		122,641
Nonrecurring termination benefit	2,338	13,652
Net projected benefit obligation at end of year	754,543	753,975	496,040
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net projected benefit obligation at beginning of year	25,086	27,352
Service cost	137	206	227
Interest cost	928	1,164	1,013
Participants’ contributions	1,777	2,100
Actuarial (gain) loss	(627)	(3,026)
Gross benefits paid	(3,893)	(4,856)
Acquisitions		2,146
Net projected benefit obligation at end of year	$ 23,408	$ 25,086	$ 27,352

Schedule of Change In Plan Asse

Schedule of Change In Plan Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 524,042,000
Employer contributions	53,924,000	$ 25,654,000
Balance at end of year	546,512,000	524,042,000
Pension
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	524,042,000	443,973,000
Actual return on plan assets, net	(651,000)	26,186,000
Employer contributions	53,924,000	25,654,000
Gross benefits paid	(30,803,000)	(23,489,000)
Acquisitions		51,718,000
Balance at end of year	546,512,000	524,042,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	2,116,000	2,756,000
Participants’ contributions	1,777,000	2,100,000
Gross benefits paid	$ (3,893,000)	$ (4,856,000)

Schedule of Funded Status (Deta

Schedule of Funded Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	$ (208,031)	$ (229,933)
Accrued benefit cost	(208,031)	(229,933)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	(23,408)	(25,086)
Accrued benefit cost	$ (23,408)	$ (25,086)

Schedule of Amounts Recognized

Schedule of Amounts Recognized on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Current pension and postretirement benefits	$ (6,048)	$ (4,183)
Noncurrent pension, postretirement and postemployment benefits	(201,983)	(225,750)
Net amount recognized at end of year	(208,031)	(229,933)
Current pension and postretirement benefits	(2,120)	(2,770)
Noncurrent pension, postretirement and postemployment benefits	(21,288)	(22,316)
Net amount recognized at end of year	$ (23,408)	$ (25,086)

Schedule of Accumulated Benefit

Schedule of Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - Pension - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 754,543	$ 753,975
Accumulated benefit obligation	688,017	684,647
Fair value of plan assets	$ 546,512	$ 524,042

Schedule of Weighted-Average As

Schedule of Weighted-Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.67%	4.25%
Rate of increase in future compensation levels	4.50%	4.50%
Discount rate	4.25%	5.17%	4.24%
Rate of increase in future compensation levels	4.50%	5.00%	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	4.25%	3.83%
Discount rate	3.83%	4.42%	3.54%

Schedule of Target Assets Alloc

Schedule of Target Assets Allocation (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	55.00%	59.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	30.00%
Total	31.00%	29.00%
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	8.00%
Total	7.00%	4.00%
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	8.00%
Total	7.00%	7.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Other securities, Target Allocation	0.00%
Total	0.00%	1.00%

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, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 546,512	$ 524,042
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	38,721	20,363
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	39,219	38,264
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	614	3,620
Quoted Prices In Active Markets For Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	16,093	3,620
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	614	3,620
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	467,958	461,795
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	62,461	58,627
Significant Unobservable Inputs (Level 3) | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	23,242	20,363
Significant Unobservable Inputs (Level 3) | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	39,219	38,264
Mid Sized To Large Cap | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	156,008	219,092
Mid Sized To Large Cap | Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	156,008	219,092
International And Emerging Growth Funds | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	144,405	87,706
International And Emerging Growth Funds | Significant Observable Inputs (Level 2) | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	144,405	87,706
Core Fixed Income | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	167,545	154,997
Core Fixed Income | Significant Observable Inputs (Level 2) | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 167,545	$ 154,997

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, 2015	Dec. 31, 2014
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 20,363	$ 19,357
Purchases, sales, settlements, net		441
Actual return on plan assets held at period end	2,879	565
Balance at end of year	23,242	20,363
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	38,264	21,764
Purchases, sales, settlements, net		15,600
Actual return on plan assets held at period end	955	900
Balance at end of year	$ 39,219	$ 38,264

Schedule of Expected Benefit Pa

Schedule of Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Pension
Defined Benefit Plan Disclosure [Line Items]
2,016	$ 34,226
2,017	36,301
2,018	38,105
2,019	40,327
2,020	42,582
Years 2021 - 2025	238,610
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2,016	2,120
2,017	2,344
2,018	2,275
2,019	2,159
2,020	2,051
Years 2021 - 2025	$ 9,170

Schedule of Assumed Health Care

Schedule of Assumed Health Care Cost Trend Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	2,020	2,019

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, 2015USD ($)
Compensation And Retirement Disclosure [Abstract]
Total service and interest cost components, Increase	$ 55
Postretirement benefit obligation, Increase	1,312
Total service and interest cost components, Decrease	(51)
Postretirement benefit obligation, Decrease	$ (1,133)

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options received by nonemployee board of directors	3,000
Weighted-average grant-date exercise price of options granted	$ 154.58	$ 121	$ 108.24
Aggregate intrinsic values of options exercised	$ 7,318	$ 9,709	$ 7,142
Aggregate intrinsic values for options outstanding	29,536
Aggregate intrinsic values for options exercisable	$ 26,925
Common stock price	$ 136.58
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
Awards available for grant	2,099,000
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	$ 5,286	$ 3,542	$ 2,772
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price	$ 136.58
Weighted-average grant-date fair value of stock awards, granted	$ 108.53	$ 109.17	$ 99.23
Aggregate intrinsic values for stock awards	$ 1,920
Aggregate intrinsic values of stock awards, distributed	$ 983	$ 584	$ 466
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	$ 154.26	$ 126.88	$ 108.24
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	$ 108.53	$ 129.14
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic values for stock awards	$ 44,412
Aggregate intrinsic values of stock awards, distributed	$ 11,387	$ 3,555	$ 9,413
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	300,000
Minimum percentage of board of directors retainer required to be paid in common stock	20.00%
Percentage of discount rate to market value on board of directors fees paid in common stock	20.00%
Common stock issued under the plan	4,035	3,804	6,583
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

Summary Information of Stock Op

Summary Information of Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding at January 1, 2015	1,054,435
Number of Options, Granted	55,244
Number of Options, Exercised	(367,497)
Number of Options, Terminated	(56,170)
Number of Options, Outstanding at December 31, 2015	686,012	1,054,435
Number of Options, Exercisable at December 31, 2015	544,755
Weighted-Average Exercise Price, Outstanding at January 1, 2015	$ 96.53
Weighted-Average Exercise Price, Granted	154.58	$ 121	$ 108.24
Weighted-Average Exercise Price, Exercised	101.31
Weighted-Average Exercise Price, Terminated	135.85
Weighted-Average Exercise Price, Outstanding at December 31, 2015	95.43	$ 96.53
Weighted-Average Exercise Price, Exercisable at December 31, 2015	$ 87.75
Weighted-Average Remaining Contractual Life (years), Outstanding at December 31, 2015	3 years 9 months 18 days
Weighted-Average Remaining Contractual Life (years), Exercisable at December 31, 2015	2 years 8 months 12 days

Summary Information For Incenti

Summary Information For Incentive Compensation Awards and Restricted Stock Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, January 1, 2015	$ 101.61
Weighted-Average Grant-Date Fair Value, Awarded	108.53	$ 109.17	$ 99.23
Weighted-Average Grant-Date Fair Value, Distributed	99.14
Weighted-Average Grant-Date Fair Value, Forfeited	102.99
Weighted-Average Grant-Date Fair Value, December 31, 2015	$ 106.45	$ 101.61
Number of Awards, January 1, 2015	27,608
Number of Awards, Awarded	22,035
Number of Awards, Distributed	(11,751)
Number of Awards, Forfeited	(552)
Number of Awards, December 31, 2015	37,340	27,608
Restricted Stock - Service Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, January 1, 2015	$ 105.62
Weighted-Average Grant-Date Fair Value, Awarded	154.26	$ 126.88	$ 108.24
Weighted-Average Grant-Date Fair Value, Distributed	77.27
Weighted-Average Grant-Date Fair Value, Forfeited	127.06
Weighted-Average Grant-Date Fair Value, December 31, 2015	$ 120.92	$ 105.62
Number of Awards, January 1, 2015	319,230
Number of Awards, Awarded	48,368
Number of Awards, Distributed	(75,411)
Number of Awards, Forfeited	(3,624)
Number of Awards, December 31, 2015	288,563	319,230
Restricted Stock - Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, January 1, 2015	$ 129.14
Weighted-Average Grant-Date Fair Value, Awarded	108.53	$ 129.14
Weighted-Average Grant-Date Fair Value, December 31, 2015	$ 117.76	$ 129.14
Number of Awards, January 1, 2015	16,388
Number of Awards, Awarded	20,219
Number of Awards, December 31, 2015	36,607	16,388

Stock-Based Compensation Expens

Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 13,589	$ 8,993	$ 7,008
Unrecognized compensation cost	22,037
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	2,679	2,020	1,734
Unrecognized compensation cost	$ 2,718
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	2 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 9,809	6,189	4,377
Unrecognized compensation cost	$ 18,985
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	2 years 9 months 18 days
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 376	257	229
Unrecognized compensation cost	$ 334
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	1 year 6 months
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 725	$ 527	$ 668

Stock-Based Compensation Expe95

Stock-Based Compensation Expense in Future for Outstanding Awards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
2,016	$ 9,818
2,017	6,578
2,018	3,817
2,019	1,824
Total	$ 22,037

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Abstract]
Lease expenses for operating lease	$ 80,417	$ 59,590	$ 45,093
Total royalties	53,658	$ 50,535	$ 41,604
Future minimum lease commitments related to contracts of affreightment	$ 246,903

Future Minimum Lease and Royalt

Future Minimum Lease and Royalty Commitments for All Noncancelable Agreements and Capital Lease Obligations (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Capital lease
2,016	$ 3,166
2,017	2,922
2,018	2,981
2,019	2,691
2,020	1,891
Thereafter	3,997
Total	17,648
Less: imputed interest	(2,724)
Present value of minimum lease payments	14,924
Less: current capital lease obligations	(2,438)
Long-term capital lease obligations	12,486
Operating Leases & Royalty Commitments
2,016	111,317
2,017	73,106
2,018	55,047
2,019	45,940
2,020	43,692
Thereafter	272,066
Total	$ 601,168

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	3,508,000
Stock Repurchased During Period, Shares	3,285,380	0	0
Common stock remaining under repurchase authorization	16,714,620
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
Rights redemption price, per right	$ 0.001
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, 2015USD ($)	Dec. 31, 2014USD ($)Bond	Dec. 31, 2013USD ($)
Commitments and Contingencies [Line Items]
Asset retirement obligation depreciation and accretion	$ 6,767,000	$ 4,584,000	$ 3,793,000
Liability reserve for insurance claims	45,911,000	$ 42,552,000
Outstanding letters of credit	46,263,000
Surety bonds	326,516,000
Balance of top 5 surety bonds	$ 88,887,000
Group of bonds, amount | Bond		5
Percentage of top 5 surety bonds	27.00%
Loan to affiliate			3,402,000
Purchase commitments for property, plant and equipment	$ 165,820,000
Capital expenditures	$ 116,681,000	$ 34,135,000	15,839,000
Percentage of employees represented in labor union	10.00%
Magnesia Specialties
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Capital Addition Purchase Commitments
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 70,431,000
Energy And Service Contracts
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 95,389,000
Revolving Line Of Credit Expires In July 2013
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations		25,000,000
Revolving Line Of Credit Expires In August 2015
Commitments and Contingencies [Line Items]
Line of credit maturity period	2018-02
Loan Due May 2016
Commitments and Contingencies [Line Items]
Loan to affiliate			$ 3,402,000
Interest-Only Note Due December 29, 2016
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, 2015	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 70,422	$ 48,727
Accretion expense	3,336	2,818
Liabilities incurred and assumed in business combinations	14,735	20,984
Liabilities settled	(4,490)	(2,061)
Revisions in estimated cash flows	5,601	(46)
Balance at end of year	$ 89,604	$ 70,422

Contractual Purchase Commitment

Contractual Purchase Commitments (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,016	$ 155,525
2,017	6,457
2,018	1,361
2,019	451
2,020	451
Thereafter	1,575
Total	$ 165,820

Business Segments - Additional

Business Segments - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2015USD ($)Segment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting Information [Line Items]
Reportable business segments | Segment		3
Total revenues		$ 3,539,570	$ 2,957,951	$ 2,155,551
Machinery and equipment acquired through capital leases		1,445	7,788	10,341
Acquisition through asset exchange		5,000	2,091
Property additions through acquisitions, Total		40,350	1,602,860	54,707
Aggregates Business
Segment Reporting Information [Line Items]
Total revenues		2,905,744	2,479,490	1,910,734
Property additions through acquisitions, Total		40,350	632,560	54,707
Intersegment Eliminations | Cement
Segment Reporting Information [Line Items]
Total revenues	$ 43,356	87,782
Corporate
Segment Reporting Information [Line Items]
Acquisition through asset exchange		4,088	3,591
Operating Segments | Cement
Segment Reporting Information [Line Items]
Total revenues		387,947	221,759
Property additions through acquisitions, Total			970,300
Operating Segments | Mid-America Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues		926,251	$ 848,855	789,806
Property additions through acquisitions, Total		$ 4,385		$ 244

Financial Data for Continuing O

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 3,539,570	$ 2,957,951	$ 2,155,551
Net Sales	3,268,116	2,679,095	1,943,218
Gross profit (loss), Total	721,767	522,360	363,957
Selling, general and administrative expenses	218,234	169,245	150,091
Earnings (Loss) from Operations	479,416	314,873	217,988
Assets employed, Total	6,961,732	7,219,754	3,185,005
Depreciation, depletion and amortization	263,587	222,746	173,761
Total property additions	364,116	1,846,421	220,281
Property additions through acquisitions, Total	40,350	1,602,860	54,707
Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	2,905,744	2,479,490	1,910,734
Net Sales	2,673,004	2,233,433	1,717,577
Gross profit (loss), Total	545,729	383,214	281,745
Selling, general and administrative expenses	137,712	120,152	114,693
Earnings (Loss) from Operations	428,954	320,097	177,570
Assets employed, Total	4,509,579	4,339,277	2,884,900
Depreciation, depletion and amortization	187,284	169,532	154,941
Total property additions	325,040	853,421	209,104
Property additions through acquisitions, Total	40,350	632,560	54,707
Operating Segments | Mid-America Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	926,251	848,855	789,806
Net Sales	851,854	770,568	720,007
Gross profit (loss), Total	256,586	216,883	192,747
Selling, general and administrative expenses	52,606	52,217	53,683
Earnings (Loss) from Operations	206,820	172,208	144,269
Assets employed, Total	1,304,574	1,290,833	1,242,395
Depreciation, depletion and amortization	61,693	63,294	66,381
Total property additions	77,640	76,753	82,667
Property additions through acquisitions, Total	4,385		244
Operating Segments | Southeast Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	304,472	274,352	245,340
Net Sales	285,302	254,986	226,437
Gross profit (loss), Total	34,197	10,653	(3,515)
Selling, general and administrative expenses	18,467	17,788	18,081
Earnings (Loss) from Operations	16,435	(5,293)	(19,849)
Assets employed, Total	583,369	604,044	611,906
Depreciation, depletion and amortization	31,644	31,955	32,556
Total property additions	12,155	23,326	72,907
Property additions through acquisitions, Total			54,463
Operating Segments | West Group | Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	1,675,021	1,356,283	875,588
Net Sales	1,535,848	1,207,879	771,133
Gross profit (loss), Total	254,946	155,678	92,513
Selling, general and administrative expenses	66,639	50,147	42,929
Earnings (Loss) from Operations	205,699	153,182	53,150
Assets employed, Total	2,621,636	2,444,400	1,030,599
Depreciation, depletion and amortization	93,947	74,283	56,004
Total property additions	235,245	753,342	53,530
Property additions through acquisitions, Total	35,965	632,560
Operating Segments | Cement
Segment Reporting Information [Line Items]
Total revenues	387,947	221,759
Net Sales	367,604	209,556
Gross profit (loss), Total	103,473	52,469
Selling, general and administrative expenses	26,626	12,741
Earnings (Loss) from Operations	47,821	40,751
Assets employed, Total	1,939,796	2,451,799
Depreciation, depletion and amortization	53,672	30,620
Total property additions	9,599	975,063
Property additions through acquisitions, Total		970,300
Operating Segments | Magnesia Specialties
Segment Reporting Information [Line Items]
Total revenues	245,879	256,702	244,817
Net Sales	227,508	236,106	225,641
Gross profit (loss), Total	78,732	84,594	83,703
Selling, general and administrative expenses	9,499	9,776	10,165
Earnings (Loss) from Operations	68,886	74,805	73,506
Assets employed, Total	147,795	150,359	154,024
Depreciation, depletion and amortization	13,769	10,394	10,564
Total property additions	8,916	2,588	4,700
Corporate
Segment Reporting Information [Line Items]
Gross profit (loss), Total	(6,167)	2,083	(1,491)
Selling, general and administrative expenses	44,397	26,576	25,233
Earnings (Loss) from Operations	(66,245)	(120,780)	(33,088)
Assets employed, Total	364,562	278,319	146,081
Depreciation, depletion and amortization	8,862	12,200	8,256
Total property additions	$ 20,561	$ 15,349	$ 6,477

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, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Information [Line Items]
Total revenues	$ 3,539,570	$ 2,957,951	$ 2,155,551
Net Sales	3,268,116	2,679,095	1,943,218
Gross profit (loss), Total	721,767	522,360	363,957
Corporate
Product Information [Line Items]
Gross profit (loss), Total	(6,167)	2,083	(1,491)
Aggregates
Product Information [Line Items]
Total revenues	2,017,761	1,805,824	1,527,986
Net Sales	1,793,660	1,570,022	1,347,486
Gross profit (loss), Total	467,053	324,093	259,054
Asphalt
Product Information [Line Items]
Total revenues	72,282	85,822	78,863
Net Sales	64,943	76,278	66,216
Gross profit (loss), Total	18,189	13,552	12,928
Ready Mixed Concrete
Product Information [Line Items]
Total revenues	657,088	431,229	146,085
Net Sales	655,788	430,519	146,079
Gross profit (loss), Total	42,942	39,129	8,337
Road Paving
Product Information [Line Items]
Total revenues	158,613	156,615	157,800
Net Sales	158,613	156,614	157,796
Gross profit (loss), Total	17,545	6,440	1,426
Aggregates Business
Product Information [Line Items]
Total revenues	2,905,744	2,479,490	1,910,734
Net Sales	2,673,004	2,233,433	1,717,577
Gross profit (loss), Total	545,729	383,214	281,745
Cement
Product Information [Line Items]
Total revenues	387,947	221,759
Net Sales	367,604	209,556
Gross profit (loss), Total	103,473	52,469
Magnesia Specialties
Product Information [Line Items]
Total revenues	245,879	256,702	244,817
Net Sales	227,508	236,106	225,641
Gross profit (loss), Total	$ 78,732	$ 84,594	$ 83,703

Domestic and Foreign Total Reve

Domestic and Foreign Total Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 3,539,570	$ 2,957,951	$ 2,155,551
Domestic
Segment Reporting Information [Line Items]
Total revenues	3,493,462	2,912,115	2,113,068
Foreign
Segment Reporting Information [Line Items]
Total revenues	$ 46,108	$ 45,836	$ 42,483

Components of Change in Other A

Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (3,631)	$ 8,066	$ 1,186
Accrued salaries, benefits and payroll taxes	(12,303)	10,136	(4,276)
Accrued insurance and other taxes	4,425	(17,641)	421
Accrued income taxes	(4,364)	27,680	3,889
Accrued pension, postretirement and postemployment benefits	(18,153)	1,150	(4,795)
Other current and noncurrent liabilities	(3,014)	(10,681)	7,373
Change in other assets and liabilities	$ (37,040)	$ 18,710	$ 3,798

Supplemental Cash Flow Infor107

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

Noncash Investing and Financing

Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]
Acquisition of assets through asset exchange	$ 5,000	$ 2,091
Acquisition of assets through capital lease	$ 1,445	7,788	$ 10,341
Seller financing of land purchase		1,500
Acquisition of TXI net assets assumed through issuances of common stock and options		$ 2,691,986

Schedule II - Valuation and 109

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 4,077	$ 4,081	$ 6,069
Charged to costs and expenses		2,863
Deductions-describe	[1]		4	1,988
Balance at end of period		6,940	4,077	4,081
Allowance for uncollectible notes receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		1,486	809	440
Charged to costs and expenses				369
Charged to other accounts-describe	[2]		1,103
Deductions-describe	[1]	901	426
Balance at end of period		585	1,486	809
Inventory valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		119,189	99,026	96,817
Charged to costs and expenses		13,365	11,762	1,165
Charged to other accounts-describe	[3]	1,400	9,942	1,044
Deductions-describe	[4]	3,370	1,541
Balance at end of period		$ 130,584	$ 119,189	$ 99,026
[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.