Deltic Timber (DEL) 10-K 5 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 13, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'DEL	'	'
Entity Registrant Name	'DELTIC TIMBER CORP	'	'
Entity Central Index Key	'0001022469	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	12,679,270	'
Entity Public Float	'	'	$284,565,813

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$4,374	$5,613
Trade accounts receivable - net	7,331	5,277
Inventories	12,439	4,894
Prepaid expenses and other current assets	3,155	2,808
Total current assets	27,299	18,592
Investment in real estate held for development and sale	57,953	57,088
Investment in Del-Tin Fiber	'	6,293
Timber and timberlands - net	248,833	240,215
Property, plant, and equipment - net	75,259	26,668
Deferred charges and other assets	2,000	4,353
Total assets	411,344	353,209
Current liabilities	'	'
Trade accounts payable	8,198	1,981
Accrued taxes other than income taxes	2,210	1,951
Income taxes payable	1,077	'
Deferred revenues and other accrued liabilities	10,330	9,094
Total current liabilities	21,815	13,026
Long-term debt	90,000	63,000
Deferred tax liabilities - net	7,514	471
Other noncurrent liabilities	25,743	44,482
Commitments and contingencies	'	'
Stockholders' equity	'	'
Cumulative preferred stock - $.01 par, authorized 20,000,000 shares, none issued	'	'
Common stock - $.01 par, authorized 50,000,000 shares, 12,813,879 shares issued	128	128
Capital in excess of par value	84,796	82,597
Retained earnings	189,720	168,608
Treasury stock	-5,693	-5,000
Accumulated other comprehensive loss	-2,679	-14,103
Total stockholders' equity	266,272	232,230
Total liabilities and stockholders' equity	$411,344	$353,209

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Financial Position [Abstract]	'	'	'
Cumulative preferred stock, par value	$0.01	$0.01	$0.01
Cumulative preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Cumulative preferred stock, shares issued	0	0	0
Common stock, par value	$0.01	$0.01	$0.01
Common stock, shares authorized	50,000,000	50,000,000	50,000,000
Common stock, shares issued	12,813,879	12,813,879	12,813,879

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Net sales	$199,702	$140,908	$121,847
Costs and expenses	'	'	'
Cost of sales	130,752	94,706	87,325
Depreciation, amortization, and cost of fee timber harvested	15,131	10,642	11,806
General and administrative expenses	19,037	18,428	15,257
Total costs and expenses	164,920	123,776	114,388
Gain on involuntary conversion	881	'	'
Operating income	35,663	17,132	7,459
Equity in earnings of Del-Tin Fiber	1,084	959	318
Interest income	13	17	38
Interest and other debt expense, net of capitalized interest	-4,578	-4,092	-4,029
Gain on bargain purchase	3,413	'	'
Other income	3,229	20	3
Income before income taxes	38,824	14,036	3,789
Income taxes	-12,632	-4,801	-1,130
Net income	$26,192	$9,235	$2,659
Earnings per common share	'	'	'
Basic	$2.06	$0.73	$0.21
Assuming dilution	$2.05	$0.73	$0.21
Dividends declared per common share	$0.40	$0.30	$0.30
Weighted average common shares outstanding (thousands)	'	'	'
Basic	12,566	12,525	12,450
Assuming dilution	12,624	12,588	12,552

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income/(Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'		'		'
Net income	$26,192		$9,235		$2,659
Items related to employee benefit plans:	'		'		'
Net gain/(loss) arising during period (net of tax)	10,973		-5,131		-6,980
Reclassification adjustment for gains/(losses) included in net income (net of tax):	'		'		'
Amortization of prior service credit	4	[1]	4	[1]	4	[1]
Amortization of actuarial losses	568	[1]	874	[1]	94	[1]
Amortization of plan amendment	-121	[1]	-121	[1]	-121	[1]
Net change in other comprehensive income/(loss)	11,424		-4,374		-7,003
Comprehensive income/(loss)	$37,616		$4,861		($4,344)
[1]	The amortizations out of comprehensive income for 2012 and 2011 have been revised to conform to the 2013 presentation.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities	'	'	'
Net income	$26,192	$9,235	$2,659
Adjustments to reconcile net income to net cash provided by operating activities	'	'	'
Depreciation, amortization, and cost of fee timber harvested	15,131	10,642	11,806
Stock-based compensation expense	2,797	2,298	2,067
Deferred income taxes	241	-649	1,109
Real estate development expenditures	-3,982	-2,822	-3,540
Real estate costs recovered upon sale	2,711	2,342	1,694
Timberland costs recovered upon sale	827	832	1,256
Equity in earnings of Del-Tin Fiber	-1,084	-959	-318
Gain on previously held equity interest	-3,165	'	'
Gain on bargain purchase	-3,413	'	'
Net increase in liabilities for pension and other postretirement benefits	1,931	1,990	136
Decrease/(increase) in operating working capital other than cash and cash equivalents	5,883	2,455	-920
Other changes in assets and liabilities	-1,927	-1,282	-1,310
Net cash provided by operating activities	42,142	24,082	14,639
Investing activities	'	'	'
Capital expenditures requiring cash, excluding real estate development	-28,315	-21,134	-12,014
Business acquisition, net of cash acquired	-5,170	'	'
Net change in purchased stumpage inventory	-1,486	1,159	-764
Advances to Del-Tin Fiber	-1,025	-2,190	-1,822
Repayments from Del-Tin Fiber	781	3,970	3,275
Net change in funds held by trustee	7	560	-568
Other - net	1,416	800	781
Net cash required by investing activities	-33,792	-16,835	-11,112
Financing activities	'	'	'
Proceeds from borrowings	12,000	18,000	15,500
Repayments of notes payable and long-term debt	-14,000	-20,111	-17,111
Treasury stock purchases	-2,224	-19	-55
Common stock dividends paid	-5,080	-3,797	-3,775
Proceeds from stock option exercises	760	1,157	2,463
Excess tax benefits from stock-based compensation expense	408	590	698
Other - net	-688	-745	-693
Deferred financing costs	-765	'	-1,094
Net cash required by financing activities	-9,589	-4,925	-4,067
Net increase/(decrease) in cash and cash equivalents	-1,239	2,322	-540
Cash and cash equivalents at January 1	5,613	3,291	3,831
Cash and cash equivalents at December 31	$4,374	$5,613	$3,291

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Preferred stock [Member]	Common stock [Member]	Capital in excess of par value [Member]	Retained earnings [Member]	Treasury Stock [Member]	Accumulated other comprehensive loss [Member]
In Thousands, except Per Share data
Balance at beginning of period at Dec. 31, 2010	'	'	$128	$79,081	$164,286	($10,758)	($2,726)
Exercise of stock options	'	'	'	347	'	'	'
Shares purchased - 36,314; 267; and 869 shares, respectively	'	'	'	'	'	-55	'
Net income	2,659	'	'	'	2,659	'	'
Net change in other comprehensive income/(loss), net of income taxes	-7,003	'	'	'	'	'	-7,003
Stock-based compensation expense	'	'	'	2,067	'	'	'
Common stock dividends declared	'	'	'	'	-3,775	'	'
Restricted stock awards	'	'	'	-1,456	'	'	'
Tax effect on stock awards	'	'	'	756	'	'	'
Forfeited restricted stock - 570; 905; and 877 shares, respectively	'	'	'	47	'	-47	'
Shares issued for incentive plans - 44,249; 67,494; and 102,296 shares, respectively	'	'	'	'	'	3,572	'
Dividends declared per common share	$0.30	'	'	'	'	'	'
Balance at end of period at Dec. 31, 2011	227,123	'	128	80,842	163,170	-7,288	-9,729
Exercise of stock options	'	'	'	181	'	'	'
Shares purchased - 36,314; 267; and 869 shares, respectively	'	'	'	'	'	-19	'
Net income	9,235	'	'	'	9,235	'	'
Net change in other comprehensive income/(loss), net of income taxes	-4,374	'	'	'	'	'	-4,374
Stock-based compensation expense	'	'	'	2,298	'	'	'
Common stock dividends declared	'	'	'	'	-3,797	'	'
Restricted stock awards	'	'	'	-1,393	'	'	'
Tax effect on stock awards	'	'	'	607	'	'	'
Forfeited restricted stock - 570; 905; and 877 shares, respectively	'	'	'	62	'	-62	'
Shares issued for incentive plans - 44,249; 67,494; and 102,296 shares, respectively	'	'	'	'	'	2,369	'
Dividends declared per common share	$0.30	'	'	'	'	'	'
Balance at end of period at Dec. 31, 2012	232,230	'	128	82,597	168,608	-5,000	-14,103
Exercise of stock options	'	'	'	123	'	'	'
Shares purchased - 36,314; 267; and 869 shares, respectively	'	'	'	'	'	-2,224	'
Net income	26,192	'	'	'	26,192	'	'
Net change in other comprehensive income/(loss), net of income taxes	11,424	'	'	'	'	'	11,424
Stock-based compensation expense	'	'	'	2,797	'	'	'
Common stock dividends declared	'	'	'	'	-5,080	'	'
Restricted stock awards	'	'	'	-935	'	'	'
Tax effect on stock awards	'	'	'	173	'	'	'
Forfeited restricted stock - 570; 905; and 877 shares, respectively	'	'	'	41	'	-41	'
Shares issued for incentive plans - 44,249; 67,494; and 102,296 shares, respectively	'	'	'	'	'	1,572	'
Dividends declared per common share	$0.40	'	'	'	'	'	'
Balance at end of period at Dec. 31, 2013	$266,272	'	$128	$84,796	$189,720	($5,693)	($2,679)

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Stockholders Equity [Abstract]	'	'	'
Cumulative preferred stock, par value	$0.01	$0.01	$0.01
Cumulative preferred stock, shares authorized	20,000,000	20,000,000	20,000,000
Cumulative preferred stock, shares issued	0	0	0
Common stock, par value	$0.01	$0.01	$0.01
Common stock, shares authorized	50,000,000	50,000,000	50,000,000
Common stock, shares issued	12,813,879	12,813,879	12,813,879
Treasury stock shares, balance at beginning of period	141,974	208,296	308,846
Treasury stock, shares purchased	36,314	267	869
Forfeited restricted stock	570	905	877
Treasury stock, shares issued for incentive plans	44,249	67,494	102,296
Treasury stock shares, balance at end of period	134,609	141,974	208,296

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Note 1 – Significant Accounting Policies
	Description of Business — Deltic Timber Corporation (“Deltic” or the “Company”) is a natural resources company engaged primarily in the growing and harvesting of timber and the manufacture and marketing of lumber and medium density fiberboard (“MDF”). Deltic owns approximately 458,600 acres of timberland, primarily in Arkansas and north Louisiana. The Company’s sawmill operations are located at Ola in central Arkansas and at Waldo in south Arkansas, and the MDF plant is located near El Dorado, Arkansas. In addition to its timber, lumber, and MDF operations, the Company is engaged in real estate development in central Arkansas.
	Business Environment — The Company is primarily a wood products producer operating in a commodity-based business environment with a major diversification in real estate development. This environment is affected by a number of factors including general economic conditions, interest rates, credit availability, building product imports, foreign exchange rates, housing starts, new and existing housing inventory, foreclosures, residential repair and remodeling, commercial construction and repair, industry capacity and production levels, the availability of contractors for logging, hauling, and shipping, the availability of raw materials, natural gas pricing, costs of fuel, and weather conditions.
	Principles of Consolidation — The consolidated financial statements of Deltic Timber Corporation include the accounts of Deltic, all majority-owned subsidiaries, and any variable interest entities of which it is the primary beneficiary. Equity investments and joint ventures are accounted for under the equity method if it is determined that the Company does not have control of the entity. Significant intercompany transactions and accounts have been eliminated.
	Business Combination — The Company accounts for business combinations using the acquisition method. The assets acquired and liabilities assumed are measured at fair value on the acquisition date using appropriate valuation methods. The operations of the acquisitions are included in the consolidated financial statements from the date of acquisition. (For additional information, see Note 4 – Business Combinations.)
	Use of Estimates — In the preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States of America, management has made a number of estimates and assumptions related to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities. Actual results may differ from those estimates.
	Cash Equivalents — Cash equivalents include investments that have a maturity of three months or less from the date of purchase.
	Accounts Receivable and Allowance for Doubtful Accounts — The Company records trade accounts receivable at net realizable value. This value includes an appropriate allowance for estimated uncollectible accounts to reflect any loss anticipated on the trade accounts receivable balances and charged to the provision for doubtful accounts. The allowance is based upon review of specific receivables outstanding and considers factors such as current overall economic conditions, industry-specific economic conditions, historical customer performance, and anticipated customer performance. In the consolidated statements of income, bad debt expense is included in cost of sales. Charges to bad debt expense were $158,000, $133,000, and $63,000 in 2013, 2012, and 2011, respectively. At December 31, 2013 and 2012, the balance in the allowance account was $172,000 and $127,000, respectively.
	Inventories — Inventories of logs, wood fiber, lumber, MDF, and supplies are stated at the lower of cost or market within Deltic’s operating areas, primarily using the average cost method. Log costs include harvest and transportation cost as appropriate. Lumber and MDF costs include materials, labor, and production overhead. (For additional information, see Note 2 – Inventories.)
	Investment in Del-Tin Fiber — On April 1, 2013, the Company acquired the remaining 50 percent membership interest of Del-Tin Fiber L.L.C., which had been accounted for as an equity method investment and is now included as a wholly-owned consolidated subsidiary. (For additional information, see Note 4 – Business Combinations.)
	Investment in Real Estate Held for Development and Sale — Real estate held for development and sale includes direct costs of land and land development and indirect cost, including amenities. Indirect and amenity costs are allocated to individual lots or acreage sold based on relative retail sales value. Direct costs are allocated to a specific neighborhood or commercial real estate tract, while indirect costs for the Company’s three developments – Chenal Valley, Chenal Downs, and Red Oak Ridge – are allocated to neighborhoods over the entire respective development area based on relative retail sales values.
	Timber and Timberlands — Timber and timberlands, which includes timberland, fee timber, purchased stumpage inventory, and logging facilities, are stated at cost, less the cost of fee timber harvested and accumulated depreciation of logging facilities, and include no estimated future reforestation cost. The cost of timber consists of fee timber acquired and reforestation costs, which includes site preparation, seedlings, and labor. The cost of fee timber harvested is based on the volume of timber harvested in relation to the estimated volume of timber recoverable. Logging facilities, which consist primarily of roads constructed and other land improvements, are depreciated using the straight-line method over a ten-year estimated life. The Company estimates its fee timber inventory using statistical information and data obtained from physical measurements and other information gathering techniques. Fee timber carrying costs, commercial thinning, silviculture, and timberland management costs are expensed as incurred.
	The Company classifies its timberlands and fee timber as either strategic or non-strategic. Strategic timberland, including pine forest and pine plantations, is prime pine sawtimber growing platforms located within or immediately adjacent to the Company sawmills’ operating regions. Deltic manages these acres using modern silviculture methods to achieve optimal volume and quality of its pine sawtimber. The Company harvests sawtimber and pulpwood in accordance with its harvest plans and generally converts sawtimber into lumber in its own sawmills and sells pulpwood in the market. Upon harvest, strategic timberlands are reforested. The Company’s timberland acquisition program is focused on the acquisition of pine-growing timberland in its current operating regions. The Company considers the acquisition and the occasional sale of strategic timberlands as investing activities. The Company has legacy hardwood and other acreage which cannot be harvested for conversion in Company sawmills, reforested as pine plantations, or managed efficiently using modern silviculture methods either due to the size of the tract or lack of proximity to other Deltic fee timberlands. These timberlands have been identified as non-strategic and/or higher and better use timberlands and are expected to be sold over time. The Company considers these sales to be an operating activity of its Woodlands segment.
	In order to acquire and sell assets, primarily timberlands, in a tax efficient manner, the Company enters into tax-deferred, like-kind exchange (“LKE”) transactions when possible. The Company generally enters into forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property, and reverse transactions, in which property is acquired and similar property is subsequently sold. A qualified LKE intermediary is used to facilitate LKE transactions. Proceeds from forward LKE transactions are held by the intermediary and are classified as restricted cash because the funds must be reinvested in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the company-owned property, the proceeds are distributed to Deltic by the intermediary and are reclassified as available cash, and applicable income taxes are determined. Amounts deposited with a third party towards the potential future purchase of property are included in deferred charges and other assets in the consolidated balance sheets and as an investing activity as changes in funds held by trustee in the consolidated statements of cash flows. At December 31, 2013, the Company had no proceeds from land sales deposited with an LKE intermediary and had $7,000 deposited at December 31, 2012. An exchange accommodation titleholder, a type of variable interest entity, is used to facilitate reverse like-kind exchanges. The acquired assets are held by the exchange accommodation titleholder until the exchange transactions are complete. If the Company determines that it is the primary beneficiary of the exchange accommodation titleholder, Deltic includes the assets held by the exchange accommodation titleholder in timber and timberlands assets on the consolidated balance sheets and recognizes any income or expense attributed to the property in the consolidated income statements.
	Property, Plant, and Equipment — Property, plant, and equipment assets are stated at cost less accumulated depreciation. Depreciation of buildings, equipment, and other depreciable assets is calculated primarily using the straight-line method. Expenditures that substantially improve and/or increase the useful life of facilities or equipment are capitalized. Maintenance and repair costs are expensed as incurred. Gains and losses on disposals or retirements are recognized in the period they occur.
	Property, plant, and equipment assets are evaluated for possible impairment on a specific asset basis or in groups of similar assets, as applicable, whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future net cash flows to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment loss is recognized for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell, and depreciation ceases.
	Revenue Recognition — The Company recognizes revenue when the following criteria are met:
	(1) persuasive evidence of an agreement exists, (2) delivery has occurred or services have been rendered, (3) the price to the buyer is fixed and determinable, and (4) collectability is reasonably assured. Delivery is not considered to have occurred until the customer takes title and assumes the risks and rewards of ownership. Revenue from the sale of lumber, MDF, and wood by-products is recorded at the time of shipment due to terms of such sale being designated free on board (“f.o.b.”) shipping point. Revenue from consignment sales are recorded when the customer assumes ownership of the product. Revenue from the sale of timber-cutting rights to third parties is recorded when legal title passes to the purchaser, which is generally upon delivery of a legally executed timber deed and receipt of payment for the timber. Revenue from intersegment timber sales is recorded when the timber is harvested; such intersegment sales, which are made at prices which generally approximate market within Deltic’s operating area, are eliminated in the consolidated financial statements.
	Revenue from the leasing of land for hunting purposes is deferred when received and subsequently recognized over the one-year lease term, which begins September 1 of each year. At December 31, 2013 and 2012, the Company had deferred hunting lease revenue totaling $1,684,000 and $1,562,000, respectively, reflected in the consolidated balance sheets in deferred revenues and other accrued liabilities. Revenue from mineral lease rental payments is deferred when received and recognized ratably over the lease term. At December 31, 2013 and 2012, the Company had deferred mineral lease revenue of $2,085,000 and $3,721,000, respectively, of which $649,000 and $2,064,000 is included in other noncurrent liabilities for 2013 and 2012, respectively, and $1,436,000 and $1,657,000 is included in other current liabilities, respectively. Mineral royalty payments are
	recognized when received. Revenue from sales of timberland and real estate is recorded when the sale is closed and legal title is transferred and the buyer’s initial and continuing investment is adequate, which is generally at the time the purchaser executes the real estate closing documents and makes payment to the title company handling the closing.
	Income Taxes — The Company uses the asset and liability method of accounting for income taxes. Under this method, the provision for income taxes includes amounts currently payable and amounts deferred as tax assets and liabilities, based on differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities, and is measured using the enacted tax rates that are expected to be in effect when the differences reverse. Deferred tax assets are reduced by a valuation allowance, which is established when it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized. The effect on deferred tax assets and liabilities of a change in tax law is recognized in income in the period that includes the enactment date. The Company continuously reviews state and federal tax returns for uncertain tax provisions. Tax benefits are recorded if it is more-likely-than-not that the positions will be sustained upon examination by the taxing authorities, and liabilities are recorded if it is deemed less likely that the position taken would prevail. These liabilities are adjusted in the period in which it is determined that the issue is settled with the relevant taxing authority, the expiration of statute of limitation for a tax year in question, a change in tax laws, or other facts become known.
	Property Taxes — Property taxes applicable to the Company’s assets are estimated and accrued in the period of assessment. At December 31, 2013 and 2012, the Company had accrued property tax expense totaling $1,798,000 and $1,783,000, respectively, reflected in the consolidated balance sheets in accrued taxes other than income taxes.
	Share-Based Compensation — The Company applies a fair value-based measurement method in accounting for share-based payment transactions with employees, recognizing the cost as the services are performed. (For additional information, see Note 17 – Incentive Plans.)
	Pensions and Other Postretirement Benefits — The Company sponsors both qualified and nonqualified, noncontributory, defined benefit retirement plans that cover all eligible employees, excluding employees of the subsidiaries. Benefits are based on years of service and final career-average-pay formulas as defined by the plans. The qualified plan is funded to accumulate sufficient assets to provide for accrued benefits. The nonqualified plan, a supplemental executive plan, is not funded; payments to retirees due under this plan are made on a monthly basis.
	The Company also sponsors a defined benefit health care plan and a life insurance benefit plan for all eligible retired employees, excluding employees of the subsidiaries. The Company measures the costs of its obligations for these plans based on its health care cost trends and actuarial assumptions, including discount rates, mortality rates, assumed rates of return, compensation increases, and turnover rates. The Company reviews its assumptions on an annual basis and makes modifications to the assumptions based on current rates and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in accumulated other comprehensive income/(loss) and amortized to net periodic cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience and market conditions.
	Net periodic costs are recognized as employees render the services necessary to earn these post retirement benefits. (For additional information, see Note 16 – Employee and Retiree Benefit Plans.)
	Advertising Costs — Advertising costs, primarily related to marketing efforts for the Company’s real estate developments, are expensed as incurred. These costs amounted to $716,000 in 2013, $732,000 in 2012, and $768,000 in 2011, and are reflected in the consolidated statements of income.
	Capitalized Interest — The Company capitalizes interest for qualifying assets during construction by applying the Company’s capitalization rate to the average amount of accumulated expenditures for the asset during the period. Interest is most often capitalized as an indirect cost for real estate development in the Company’s real estate operations. (For additional information, see Note 18 – Supplemental Cash Flows Disclosures.)
	Capital Expenditures — Capital expenditures include additions to investment in real estate held for development and sale; timber and timberlands; and property, plant, and equipment.
	Net Change in Purchased Stumpage Inventory — Purchased stumpage inventory consists of timber-cutting rights purchased from third parties specifically for use in the Company’s sawmills. Depending on the timing of acquisition and usage of this acquired stumpage inventory, the net change in this inventory can either be a source or use of cash in the Company’s consolidated statements of cash flows.
	Earnings per Common Share — Basic earnings per share is computed using the two-class method and is based on earnings available to common shareholders less accrued preferred dividends, if any, and the weighted average number of common shares outstanding. The diluted earnings per share amounts are computed based on earnings available to common shareholders and the weighted average number of common shares outstanding, including shares assumed to be issued under the Company’s stock incentive plans using the treasury-stock method, unless anti-dilutive. (For a reconciliation of amounts used in per share computations, see Note 19 – Earnings per Share.)
	Shipping and Handling Costs — Shipping and handling costs, such as freight to our customers’ destinations, are included in cost of sales in the Company’s consolidated statements of income. These costs, when included in the amount invoiced to customers, are also recognized in net sales.
	Off-Balance Sheet Arrangements — The Company evaluates its transactions to determine if any variable interest entities exist. If it is determined that Deltic is the primary beneficiary of a variable interest entity, that entity is consolidated into Deltic’s financial statements.
	Effect of Recently Issued Authoritative Accounting Guidance — Financial Accounting Standards Update No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Topic 220),” became effective for the Company on January 1, 2013. The amendment of this update requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component including the respective line item of net income when reclassed in its entirety. (For additional information, refer to Note 15 – Other Comprehensive Income Disclosures.)
	Subsequent Events — The Company has evaluated subsequent events through the date the financial statements were issued.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	Note 2 – Inventories
	Inventories at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Raw materials   - Logs	$	1,612		1,341
	- Del-Tin – wood fiber		440		—
	Finished goods  - Lumber		4,145		3,231
	- Medium density fiberboard		3,110		—
	- Medium density fiberboard consigned to others		708		—
	Supplies		2,424		322
		$	12,439		4,894
	The Company utilizes the lower of cost or market basis for determining inventory-carrying values. Lumber and MDF inventory amounts at December 31, 2013 and 2012, are stated at lower of cost or net realizable value.

Prepaid_Expenses_and_Other_Cur

Prepaid Expenses and Other Current Assets	12 Months Ended
	Dec. 31, 2013
Prepaid Expense and Other Assets Current [Abstract]	'
Prepaid Expenses and Other Current Assets	'
	Note 3 – Prepaid Expenses and Other Current Assets
	Prepaid expenses and other current assets at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Short-term deferred tax assets	$	1,901		2,074
	Refundable income taxes		109		123
	Prepaid expenses		692		88
	Other current assets		453		523
		$	3,155		2,808

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combinations	'
	Note 4 – Business Combinations
	On April 1, 2013, the Company acquired the remaining 50 percent membership interest of Del-Tin Fiber L.L.C. (“Del-Tin Fiber”) for an agreed-upon amount of approximately $20,000,000, which was considered to be comprised of a cash payment of $5,170,000 and the value of 50 percent of the long-term debt. Del-Tin Fiber was an existing joint venture that operates a medium density fiberboard (“MDF”) manufacturing facility in El Dorado, Arkansas. This facility has a rated annual production capacity of 150,000,000 square feet, on a  3⁄4-inch basis. The acquisition resulted in Deltic obtaining a controlling financial interest in Del-Tin Fiber due to the Company’s 100 percent ownership of the membership interest of Del-Tin Fiber. As a result, Deltic began treating Del-Tin Fiber as a consolidated subsidiary of the Company as of the acquisition date. With this consolidation, on April 1, 2013, Deltic’s Consolidated Balance Sheet included the $29,000,000 of long-term debt of Del-Tin Fiber, which represents the L.L.C.’s recorded liability for the outstanding industrial bonds due 2027. This acquisition
	was consistent with Deltic’s strategy of growth through acquisitions and vertical integration, since Del-Tin Fiber uses residual by-products generated by Deltic’s sawmill operations as the raw material in its manufacturing process.
	Prior to this acquisition the Company owned 50 percent of the membership interest of Del-Tin Fiber and reported it as an equity method investment. In accordance with ASC 805, Deltic accounted for the acquisition as a business combination achieved in stages. Thus, the Company remeasured the carrying amount of its previously held investment in the joint venture to current fair value and recorded a $3,165,000 pretax remeasurement gain, determined by the amount by which the acquisition-date fair value of this investment, of $10,786,000, exceeded its previous carrying amount of $7,621,000. This gain was included in Other Income in the Company’s Consolidated Statements of Income for the year ended December 31, 2013.
	The acquisition date fair value of the Company’s existing 50 percent equity interest in Del-Tin Fiber was derived by applying the ownership percentage to the fair value of the net assets of Del-Tin Fiber. It was determined that no discounting was required, since prior to the acquisition, there was equally shared control of the joint venture by the owning members without specific benefit identified that related to the existence of control. In addition, Deltic continues to operate the existing facility to produce MDF.
	The fair value of assets acquired and liabilities assumed was determined using a combination of various methodologies, as appropriate, depending on the asset type and classification. Current assets and liabilities were valued at book value since carrying value approximated fair value. Property, plant, and equipment assets were valued under various methodologies, including the market approach using comparable sales for real estate and the cost approach discounted for obsolescence for plant and equipment. Intangible assets were valued using the discounted income approach and using a discount rate of 15 percent. Long-term debt was valued at book value since it approximated fair value. There was no tax-deductible goodwill as a result of the Del-Tin Fiber acquisition.
	The total cost of the acquisition has been allocated to the assets acquired and the liabilities assumed based upon their estimated fair values at the date of the acquisition and is presented in the next table.
	The purchase price allocated to the net tangible and intangible assets acquired and liabilities assumed based on their fair values as of the acquisition date and the calculation of the gain on bargain purchase were as follows:
	(Thousands of dollars)
	Accounts receivable		$	4,229
	Inventories			4,805
	Other current assets			360
	Property, plant, and equipment			40,960
	Intangible assets1			1,700
	Other assets			171
	Current liabilities			(1,653	)
	Deferred tax liabilities			(2,203	)
	Long-term liabilities			(29,000	)
	Net assets acquired			19,369
	Cash paid			(5,170	)
	Fair value of previously held investment in Del-Tin Fiber			(10,786	)
	Gain on bargain purchase		$	3,413
	1	The acquired intangible assets consist of internally developed software which is being amortized over three years.
	The purchase price allocation resulted in the recognition of a gain on bargain purchase of approximately $3,413,000, which was included in the Consolidated Statements of Income for the year ended December 31, 2013. The gain on bargain purchase was the result of the fair value of the identifiable net assets acquired exceeding the purchase price paid for the acquisition. The seller, Deltic’s former joint venture partner, was motivated to sell its half of Del-Tin Fiber in order to facilitate the sale of its remaining building products business to a major building products company that had no interest in owning a membership interest in a joint venture. This sale was part of the former joint venture partner’s stated plan to divest itself of its building product assets by the end of the year 2013.
	Transaction costs related to the acquisition of Del-Tin Fiber were insignificant and were expensed as incurred. The cash paid to the seller at the closing of the acquisition was funded by cash on hand.
	The results of Del-Tin Fiber’s operations have been included in the consolidated financial statements subsequent to the acquisition date and were included in the Company’s Manufacturing segment. Subsequent to the acquisition date, for the year ended December 31, 2013, the Company included net sales of approximately $47,812,000, from Del-Tin Fiber in its Consolidated Statements of Income. Deltic’s operating income for the year ended December 31, 2013, included $3,068,000 from Del-Tin Fiber operations.
	The following unaudited supplemental pro forma financial information for the years ended December 31, 2013 and 2012 represents the results of operations of Deltic Timber Corporation as if the Del-Tin Fiber acquisition had occurred on January 1, 2012. This information is based on historical results of operations, adjusted for certain acquisition accounting adjustments and does not purport to represent Deltic Timber’s actual results of operation as if the acquisition transaction described above would have occurred as of January 1, 2012, nor is it necessarily indicative of future results.
			Twelve Months Ended
			December 31,
	(Thousands of dollars, except per share amounts)		2013			2012
	Net sales		$	217,268		$	207,446
	Net income			21,193			8,846
	Basic earnings per common share			1.69			0.71
	Diluted earnings per common share			1.68			0.7

Timber_and_Timberlands

Timber and Timberlands	12 Months Ended
	Dec. 31, 2013
Timber and Timberlands [Abstract]	'
Timber and Timberlands	'
	Note 5 – Timber and Timberlands
	Timber and timberlands at December 31 consisted of the following:
	(Thousands of dollars)	2013			2012
	Purchased stumpage inventory	$	2,388			902
	Timberlands		102,609			99,159
	Fee timber		253,768			246,105
	Logging facilities		2,628			2,601
			361,393			348,767
	Less accumulated cost of fee timber harvested and facilities depreciation		(113,056	)		(108,873	)
	Strategic timber and timberlands		248,337			239,894
	Non-strategic timber and timberlands		496			321
		$	248,833			240,215
	In 1999, the Company initiated a program to identify and sell non-strategic timberlands and to use the sales proceeds to purchase pine timberlands that are strategic to its operations. In 2008, Deltic identified approximately 10,000 acres of non-strategic timberlands that existed within its timberland base to be sold. Other non-strategic acreage exists within the Company’s land base, but Deltic has not completely identified the number of acres that fit within this category. As the Company identifies these acres and determines they are either smaller tracts of pine timberland that cannot be strategically managed or tracts of hardwood bottomland that cannot be converted into pine growing acreage, they will be sold. As of December 31, 2013 and 2012, approximately 1,000 acres and 700 acres, respectively were available for sale. Included in the Woodlands operating income are gains from sales of non-strategic timberland of $1,715,000, $1,910,000, and $2,797,000 in 2013, 2012, and 2011, respectively. Occasionally Deltic engages in land-for-land exchanges that are recorded as sales due to the nature of the land involved. No gains were recognized from non-monetary land exchanges in 2013 or 2012, but gains of $47,000 were recognized in 2011.
	Cost of fee timber harvested amounted to $4,494,000, $4,497,000, and $4,963,000 in 2013, 2012, and 2011, respectively. Depreciation of logging facilities was $92,000, $94,000, and $93,000 for the years 2013, 2012, and 2011, respectively.

Property_Plant_and_Equipment

Property, Plant, and Equipment	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant, and Equipment	'
	Note 6 – Property, Plant, and Equipment
	Property, plant, and equipment at December 31 consisted of the following:
	(Thousands of dollars)	Range of	2013			2012
		Useful Lives
	Land	N/A	$	947			357
	Land improvements	10-20 years		8,835			6,322
	Buildings and structures	10-20 years		22,599			13,985
	Machinery and equipment	3-15 years		145,741			99,867
				178,122			120,531
	Less accumulated depreciation			(102,863	)		(93,863	)
			$	75,259			26,668
	Depreciation of property, plant, and equipment charged to operations was $10,544,000, $6,051,000, and $6,749,000 in 2013, 2012, and 2011, respectively. Gains/(losses) on disposals or retirements of assets included in operating income were $362,000, $(128,000), and $36,000 in 2013, 2012, and 2011, respectively.

Deferred_Revenues_and_Other_Ac

Deferred Revenues and Other Accrued Liabilities	12 Months Ended
	Dec. 31, 2013
Payables And Accruals [Abstract]	'
Deferred Revenues and Other Accrued Liabilities	'
	Note 7 – Deferred Revenues and Other Accrued Liabilities
	Deferred revenues and other accrued liabilities at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Deferred revenues – current	$	3,697		3,794
	Vacation accrual		1,290		971
	Deferred compensation		3,442		2,720
	All other current liabilities		1,901		1,609
		$	10,330		9,094

Other_Noncurrent_Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2013
Payables And Accruals [Abstract]	'
Other Noncurrent Liabilities	'
	Note 8 – Other Noncurrent Liabilities
	Other noncurrent liabilities at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Accumulated postretirement benefit obligation	$	10,391		12,132
	Excess retirement plan		4,457		9,063
	Accrued pension liability		6,383		17,254
	Deferred revenue – long-term portion		649		2,064
	Uncertain tax positions liability		1,185		1,325
	All other noncurrent payables		2,678		2,644
		$	25,743		44,482

Credit_Facilities

Credit Facilities	12 Months Ended
	Dec. 31, 2013
Credit Facilities [Abstract]	'
Credit Facilities	'
	Note 9 – Credit Facilities
	The Company has an agreement with SunTrust Bank together with other banks, which provides an unsecured and committed revolving credit facility totaling $340,000,000 and includes an option to request an increase in the amount of aggregate revolving commitments by $50,000,000. The most recent amendment of this credit facility occurred on May 2, 2013, and expires on May 1, 2018. To facilitate the amendment, $765,000 in fees were incurred and are being amortized as additional interest over the term of the agreement, together with the remaining unamortized prior costs of $617,000. At December 31, 2013 and 2012, $21,000,000 and $23,000,000, respectively, were outstanding and included in long-term debt. As of December 31, 2013 and 2012, $319,000,000 and $274,500,000, respectively, were available in excess of all borrowings outstanding under or supported by the respective facilities. Borrowings under the current agreement bear interest at a base rate or an adjusted Eurodollar rate plus an applicable margin, depending upon the type of loan the Company executes. The applicable margin component of the interest rate varies with the type of loan and the Company’s total debt to capital ratio. The agreement contains certain restrictive financial covenants, including a leverage ratio of no greater than .65 to 1.0, minimum timber market value greater than 175 percent of outstanding total senior indebtedness, and limitations on the incurrence of debt. Fees associated with the current revolving credit facility include a commitment fee of .20 to .35 percent per annum on the unused portion of the committed amount.
	The Company may also borrow up to $1,000,000 under a short-term credit facility with BancorpSouth. The agreement expires December 31, 2014, with annual renewal. The amount available to the Company under this facility is reduced by any borrowings by the Company. As of December 31, 2013 and 2012, Deltic had no borrowings outstanding under this line of credit, resulting in $1,000,000 available to the Company. Borrowings bear interest based upon the New York Prime rate. Deltic also has an agreement with BancorpSouth to provide letters of credit. New letters of credit are requested by the Company and are approved and issued by BancorpSouth on a case-by-case basis. Outstanding letters of credit as of December 31, 2013 and 2012 were $554,000 and $719,000, respectively.

Indebtedness

Indebtedness	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Indebtedness	'
	Note 10 – Indebtedness
	The Company’s indebtedness at December 31 consisted of the following:
	(Thousands of dollars)		2013			2012
	Notes payable, 1.54%*, due 2018 (See Note 9 – Credit Facilities)		$	21,000			23,000
	Senior notes payable, 6.10%, due 2016			40,000			40,000
	Union County, Arkansas Taxable Industrial Revenue Bonds, .31%, due 2027			29,000			—
	Long-term debt		$	90,000			63,000
		*	Weighted average interest rate at December 31, 2013.
	The Company has private placement debt outstanding of $40,000,000 of Series A Senior Notes (“Notes”) with Pacific Coast Farm Credit, a division of American AgCredit, due and payable December 18, 2016. The interest rate for the Notes has been 6.10 percent since December 18, 2008, and will remain at that rate for the remainder of the term of the Notes. No installment payments are required, but the terms allow for prepayments at the option of the Company. The agreement contains certain restrictive financial covenants, including a minimum consolidated net worth of the sum of $175,567,000, plus 50 percent of net income accrued during each quarter thereafter commencing after December 31, 2006, plus 100 percent of the net proceeds from any public or private offering of common or preferred stock of the Company, a maximum funded debt to capitalization ratio of .6 to 1, a fixed charge coverage ratio of not less than 2.5 to 1, and a requirement to maintain a timber market value greater than 200 percent of outstanding total senior indebtedness. Some covenant requirements of the Senior Notes are the same as for the revolving credit facility, some are more restrictive, and some apply only to the Senior Notes.
	With consolidation of Del-Tin Fiber into the Company’s financial statements on April 1, 2013, Deltic’s long-term debt includes $29,000,000 in Union County, Arkansas Taxable Industrial Revenue Bonds (Del-Tin Fiber project) 1998 Series due October 1, 2027, (the “Bonds”). The Bonds were issued by Union County, Arkansas in the amount of $60,000,000, in December 1998 to finance completion of the construction of the MDF plant as well as the acquisition, construction, and improvement of certain sewage and solid waste disposal facilities related to the MDF plant. On September 1, 2004, $31,000,000 of the Bonds were retired. Neither the State of Arkansas, nor Union County, Arkansas has any liability under the Bonds. Del-Tin Fiber and Union County contemporaneously entered into a lease agreement (the “Lease Agreement”) that obligated Del-Tin Fiber to make lease payments in an amount necessary to fund the debt service on the Bonds. The Bonds were payable solely from the proceeds of the letters of credit issued to support the respective Bonds and from Company payments under the Loan Agreement and the Lease Agreement with Union County, Arkansas. The Company has unconditionally guaranteed the payment of all amounts owing under the Bonds to the bondholders. The Company’s indebtedness has been presented in these financial statements as though the Company was directly liable for the Bonds. If the Bonds are not remarketed as allowed under the agreement, the letter of credit and the commitment of the lenders are available to support repayment. Prior to the April 1, 2013 acquisition of Del-Tin Fiber, Deltic was a guarantor of one-half of the letter of credit supporting the bonds. These Bonds bear interest at a variable rate determined weekly by the remarketing agent of the Bonds. Interest is due on the first business day of the month, and all unpaid interest and all principal is due on October 1, 2027. The average interest rate on the Bonds was .38 percent in 2013, .70 percent in 2012, and .87 percent in 2011.
	As of December 31, 2013, the scheduled maturities of long-term debt for the next five years are none in 2014 and 2015, $40,000,000 in 2016, none in 2017, and $21,000,000 in 2018. (For additional information regarding financial instruments, see Note 9 – Credit Facilities and Note 13 – Fair Value of Financial Instruments.)
	The table below sets forth the most restrictive ratio requirements of the covenants for the credit facility and Senior Notes Payable and the status with respect to these covenants as of December 31, 2013 and 2012.
			Covenants			Actual Ratios at			Actual Ratios at
			Requirements			Dec. 31, 2013			Dec. 31, 2012
	Leverage ratio should be less than:1			.60 to 1			.254 to 1			.253 to 1
	Total outstanding debt as a percentage of total debt allowed based on the minimum timber market value covenant:2			—	2		48.24	%		44.15	%
	Fixed charge coverage ratio should be greater than:3			2.50 to 1			10.04 to 1			5.39 to 1
	1	The leverage ratio is calculated as total debt divided by total capital. Total debt includes indebtedness for borrowed money, secured liabilities, obligations in respect of letters of credit, and guarantees. Total capital is the sum of total debt and net worth. Net worth is calculated as total assets minus total liabilities, as reflected on the balance sheet. This covenant is applied at the end of each quarter. The revolving credit facility requirement is for the leverage ratio to be less than .65 to 1.
	2	Timber market value must be greater than 200 percent of total debt (as defined in (1) above.) The timber market value is calculated by multiplying the average price received for sales of timber for the preceding four quarters by the current quarter’s ending inventory of timber. This covenant is applied at the end of the quarter on a rolling four-quarter basis. The revolving credit facility requirement is for the timber market value to be greater than 175 percent of total debt (as defined in (1) above.)
	3	The fixed charge coverage ratio is calculated as EBITDA (earnings before interest, taxes, depreciation, depletion, and amortization) increased by non-cash compensation expense and other non-cash expenses and decreased by dividends paid and income tax paid, divided by the sum of interest expense and scheduled principal payments made on debt during the period. This covenant is applied at the end of the quarter on a rolling four-quarter basis. This covenant only applies to the Senior Notes Payable.
	Based on management’s current operating projections, the Company believes it will remain in compliance with the debt covenants and have sufficient liquidity to finance operations and pay all obligations. However, depending on market conditions and the return of economic uncertainties, in future periods the Company could request amendments, or waivers for covenants, or obtain refinancing in future periods. There can be no assurance that the Company will be able to obtain amendments or waivers or negotiate agreeable refinancing terms should it become necessary.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 11 – Income Taxes
	The components of income tax expense/(benefit) related to income from operations for the years ended December 31, 2013, 2012, and 2011 are as follows:
	(Thousands of dollars)	2013			2012			2011
	Federal
	Current	$	10,237			4,743			930
	Deferred		138			(685	)		1
			10,375			4,058			931
	State
	Current		2,154			707			(909	)
	Deferred		103			36			1,108
			2,257			743			199
	Total income tax expense	$	12,632			4,801			1,130
	The following table provides a reconciliation of the Company’s income tax expense at the statutory U.S. federal rate of 35 percent to the actual income tax expense for the years ended December 31, 2013, 2012, and 2011.
	(Thousands of dollars)	2013			2012			2011
	U.S. Federal income tax using statutory tax rate	$	13,588			4,913			1,326
	State tax, net of federal tax benefit		1,458			446			160
	Permanent differences		(1,219	)		(558	)		(306	)
	Tax effects resulting from:
	Gain on bargain purchase		(1,195	)		—			—
	Other		—			—			(50	)
	Income tax provision as reported	$	12,632			4,801			1,130
	The Company’s deferred tax assets and deferred tax liabilities at December 31, 2013 and 2012, consisted of the following:
	(Thousands of dollars)	2013			2012
	Deferred tax assets
	Investment in real estate held for development and sale	$	16,914			16,560
	Postretirement and other employee benefits		13,435			19,652
	Other deferred tax assets		2,360			2,942
	Total deferred tax assets		32,709			39,154
	Deferred tax liabilities
	Investment in Del-Tin Fiber		—			(5,246	)
	Timber and timberlands		(26,158	)		(25,520	)
	Property, plant, and equipment		(11,838	)		(3,797	)
	Other deferred tax liabilities		(326	)		(151	)
	Total deferred tax liabilities		(38,322	)		(34,714	)
	Net deferred tax assets/(liabilities)	$	(5,613	)		4,440
	The deferred tax assets and liabilities are classified in the accompanying consolidated balance sheets as follows:
	(Thousands of dollars)	2013			2012
	Current tax assets	$	1,901			2,074
	Long-term tax assets		—			2,837
	Long-term tax liabilities		(7,514	)		(471	)
	Net deferred tax assets/(liabilities)	$	(5,613	)		4,440
	In assessing the realizability of deferred tax assets, Deltic’s management considers whether it is more-likely-than-not that some portion or all of the Company’s total deferred tax assets will not be realized. The ultimate realization of these deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based on the level of historical taxable income and projections for future taxable income over the periods in which the temporary differences are anticipated to reverse, management believes it is more-likely-than-not that the Company will realize the benefits of its deferred tax assets at December 31, 2013, as reductions of future taxable income or by utilizing available tax planning strategies. However, the amount of the net deferred tax assets considered realizable could be adjusted in the future if estimates of taxable income are revised.
	Unrecognized tax benefits represent potential future obligations to taxing authorities if uncertain tax positions the Company has taken, primarily on previously filed state income tax returns, are not sustained. Liabilities established for unrecognized tax benefits may not be combined with deferred tax assets or liabilities.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding both interest and any related federal benefits) is as follows:
	(Thousands of dollars)	2013			2012
	Balance at January 1	$	1,331			1,774
	Lapse of statute		(146	)		(443	)
	Balance at December 31	$	1,185		$	1,331
	If the Company were to prevail on all unrecognized tax benefits recorded on the balance sheet, approximately $776,000, as of December 31, 2013, would benefit the effective tax rate. The Company’s policy is to recognize interest expense related to unrecognized tax benefits in interest expense and penalties in other expenses. During 2013, the Company recognized $121,000 in interest expense for these items. The Company had approximately $621,000 and $451,000 accrued in deferred revenue and other accrued liabilities for interest and penalties at December 31, 2013 and 2012, respectively. The Company anticipates the entire balance of unrecognized tax benefits and accrued liabilities for interest and penalties could potentially be reversed within the next twelve months. The Company is no longer subject to federal and state income tax examination by tax authorities for years before 2010.

Stockholders_Rights_Plan

Stockholders Rights Plan	12 Months Ended
	Dec. 31, 2013
Stockholders Rights Plan [Abstract]	'
Stockholders Rights Plan	'
	Note 12 – Stockholders Rights Plan
	The Company has a Stockholders Rights Plan (“Rights Plan”), which provides for each eligible common shareholder to receive a dividend of one preferred stock purchase right (“Right”) for each outstanding share of the Company’s common stock held. On October 19, 2006, the Company’s Board of Directors amended the Rights Plan to, among other items, extend its term to December 31, 2016, and to increase the exercise price of the rights to $200 per share. The Rights will detach from the common stock and become exercisable: (1) following a specified period of time after the date of the first public announcement that a person or group of affiliated or associated persons (“Acquiring Person”), has become the beneficial owner of 15 percent or more of the Company’s common stock or (2) following a specified amount of time of the commencement of a tender or exchange offer by any Acquiring Person, which would, if consummated, result in such persons becoming the beneficial owner of 15 percent or more of the Company’s common stock. In either case, the detachment of the Rights from the common stock is subject to extension by a majority of the directors of the Company. The Rights have certain anti-takeover effects and will cause substantial dilution to any Acquiring Person that attempts to acquire the Company without conditioning the offer on a substantial number of Rights being acquired. Other terms of the Rights are set forth in, and the foregoing description is qualified in its entirety by, the Rights Agreement between the Company and Harris N.A. (formerly known as Harris Trust and Savings Bank), as Rights Agent.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Note 13 – Fair Value of Financial Instruments
	Fair value measurement accounting establishes a fair value hierarchy based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets on identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants.
	Information pertaining to the fair value of the pension plan assets is found in Note 16 – Employee and Retiree Benefit Plans.
	The following is a description of the valuation methodologies used for liabilities measured at fair value.
	Nonqualified Employee Savings Plan — Consists of mutual funds, which are valued at the net asset value of shares held by the plan at year-end, at quoted market prices.
	The fair value measurements for the Company’s financial liabilities accounted for at fair value on a recurring basis at December 31, 2013 are presented in the following table:
				Fair Value Measurements at Reporting Date Using
		December 31,		Quoted Prices in		Significant		Significant
				Active Markets for		Observable		Unobservable
				Identical		Inputs		Inputs
				Liabilities Inputs
	(Thousands of dollars)	2013		Level 1		Level 2		Level 3
	Liabilities
	Nonqualified employee savings plan	$	1,353		1,353		—		—
	Long-term Debt, Including Current Maturities — The fair value is estimated by discounting the scheduled debt payment streams to present value based on market rates for which the Company’s debt could be refinanced.
	The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2013 and 2012. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes financial instruments included in current assets and liabilities, except current maturities of long-term debt, all of which have fair values approximating carrying values.
		2013				2012
	(Thousands of dollars)	Carrying		Estimated		Carrying		Estimated
		Amount		Fair Value		Amount		Fair Value
	Financial liabilities
	Long-term debt, including current liabilities	$	90,000		94,534		63,000		68,029

Concentration_of_Credit_Risks

Concentration of Credit Risks	12 Months Ended
	Dec. 31, 2013
Risks And Uncertainties [Abstract]	'
Concentration of Credit Risks	'
	Note 14 – Concentration of Credit Risks
	Financial instruments, which potentially subject the Company to credit risk, are trade accounts receivable. These receivables normally arise from the sale of wood products, MDF, and real estate. Concentration of credit with respect to these trade accounts receivable is limited due to the large number of customers comprising the Company’s customer base. No single recurring customer accounted for a significant amount of the Company’s sales of wood products or real estate in 2013, 2012, or 2011. At December 31, 2013 and 2012, there was no significant accounts receivable from a single customer. The Company performs ongoing credit evaluations of its customers and generally does not require collateral to support accounts receivable.

Other_Comprehensive_Income_Dis

Other Comprehensive Income Disclosures	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Other Comprehensive Income Disclosures	'
	Note 15 – Other Comprehensive Income Disclosures
	The following tables detail the changes in accumulated other comprehensive loss (“AOCL”) by component for the twelve months ended December 31, 2013 and 2012:
	Changes in Accumulated Other Comprehensive Loss by Component (Net of Tax)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2013	$	(9,553	)		(3,380	)		(1,170	)		(14,103	)
	Amounts reclassified from AOCL		529			38			(116	)		451
	Net gain arising during period		6,614			2,860			1,499			10,973
	Net current period other comprehensive income		7,143			2,898			1,383			11,424
	AOCL at December 31, 2013	$	(2,410	)		(482	)		213			(2,679	)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2012	$	(8,124	)		(855	)		(750	)		(9,729	)
	Amounts reclassified from AOCL		608			226			(77	)		757
	Net loss arising during period		(2,037	)		(2,751	)		(343	)		(5,131	)
	Net current period other comprehensive loss		(1,429	)		(2,525	)		(420	)		(4,374	)
	AOCL at December 31, 2012	$	(9,553	)		(3,380	)		(1,170	)		(14,103	)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2011	$	(2,638	)		(304	)		216			(2,726	)
	Amounts reclassified from AOCL		94			4			(121	)		(23	)
	Net loss arising during period		(5,580	)		(555	)		(845	)		(6,980	)
	Net current period other comprehensive loss		(5,486	)		(551	)		(966	)		(7,003	)
	AOCL at December 31, 2011	$	(8,124	)		(855	)		(750	)		(9,729	)
	Reclassification Out of Accumulated Other Comprehensive Loss
	Details about AOCL Components
		For the Year Ended December 31, 2013
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	Amortization of prior service costs	$	18			(11	)		—			7
	Amortization of actuarial losses		852			74			8			934
	Amortization of plan amendment		—			—			(199	)		(199	)
	Total before tax		870			63			(191	)		742
	Income tax benefit/(expense)		(341	)		(25	)		75			(291	)
	Total reclassifications – net of tax	$	529			38			(116	)		451
	Amounts in parentheses indicate expenses. These items are included in the computation of net periodic retirement and postretirement costs. See Note 16 – Employee and Retiree Benefit Plans.
		For the Year Ended December 31, 2012
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	Amortization of prior service costs	$	18			(11	)		—			7
	Amortization of actuarial losses		982			383			73			1,438
	Amortization of plan amendment		—			—			(199	)		(199	)
	Total before tax		1,000			372			(126	)		1,246
	Income tax benefit/(expense)		(392	)		(146	)		49			(489	)
	Total reclassifications – net of tax	$	608			226			(77	)		757
	Amounts in parentheses indicate expenses. These items are included in the computation of net periodic retirement and postretirement costs. See Note 16 – Employee and Retiree Benefit Plans.
		For the Year Ended December 31, 2011
	(Thousands of dollars)	Defined			Defined			Post			Total
Benefit		Benefit			Retirement
Funded		Unfunded			Benefit
Retirement		Retirement			Plan
Plan		Plan
Amortization of prior service costs	$	18			(11	)		—			7
Amortization of actuarial losses		137			18			—			155
Amortization of plan amendment		—			—			(199	)		(199	)
Total before tax		155			7			(199	)		(37	)
Income tax benefit/(expense)		(61	)		(3	)		78			14
Total reclassifications – net of tax	$	94			4			(121	)		(23	)
Amounts in parentheses indicate expenses. These items are included in the computation of net periodic retirement and postretirement costs. See Note 16 – Employee and Retiree Benefit Plans.
Tax Effects by Component
	For the Year Ended December 31, 2013
(Thousands of dollars)	Before			Tax			Net of
	Tax			(Expense)			Tax
	Amount			or Benefit			Amount
Gains/(losses) arising during the period	$	18,054			(7,081	)		10,973
Amortization of prior service costs		7			(3	)		4
Amortization of actuarial losses/(gains)		934			(366	)		568
Amortization of plan amendment		(199	)		78			(121	)
	$	18,796			(7,372	)		11,424
	For the Year Ended December 31, 2012
(Thousands of dollars)	Before			Tax			Net of
	Tax			(Expense)			Tax
	Amount			or Benefit			Amount
Gains/(losses) arising during the period	$	(8,442	)		3,311			(5,131	)
Amortization of prior service costs		7			(3	)		4
Amortization of actuarial losses/(gains)		1,438			(564	)		874
Amortization of plan amendment		(199	)		78			(121	)
	$	(7,196	)		2,822			(4,374	)
Tax Effects by Component (cont.)
	For the Year Ended December 31, 2011
(Thousands of dollars)	Before			Tax			Net of
	Tax			(Expense)			Tax
	Amount			or Benefit			Amount
Gains/(losses) arising during the period	$	(11,485	)		4,505			(6,980	)
Amortization of prior service costs	$	7			(3	)		4
Amortization of actuarial losses/(gains)		155			(61	)		94
Amortization of plan amendment		(199	)		78			(121	)
	$	(11,522	)		4,519			(7,003	)

Employee_and_Retiree_Benefit_P

Employee and Retiree Benefit Plans	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Employee and Retiree Benefit Plans	'
	Note 16 – Employee and Retiree Benefit Plans
	The Company has a funded, qualified defined benefit retirement plan (“Retirement Plan”) that covers each employee of Deltic Timber Corporation, excluding employees of the subsidiaries, who completes 1,000 hours of service for a twelve-month period, once employment has commenced, and continues to meet both the 1,000 hours requirement and the employment requirement for each twelve-month period. An unfunded, nonqualified supplemental executive retirement plan is maintained for certain current and former employees. All contributions to both plans are made by the Company. The plans provide defined benefits based on years of benefit service and average monthly compensation as defined by the Company’s Retirement Plan. The Company determines the vested benefit obligation on the actuarial present value based on the employee’s expected date of retirement. The Company also sponsors a plan for retired employees, excluding employees of the subsidiaries, that provides comprehensive healthcare benefits (supplementing Medicare benefits for those eligible) and life insurance benefits. Costs are accrued for this plan during the service lives of covered employees. Retirees contribute a portion of the self-funded cost of healthcare benefits and the Company contributes the remainder. The Company pays premiums for life insurance coverage arranged through an insurance company. The health care plan is funded on a pay-as-you-go basis. The Company retains the right to modify or terminate the benefits and/or cost-sharing provisions.
	The following table sets forth the plans’ benefit obligations, fair value of plan assets, and funded status at December 31, 2013 and 2012.
		Funded						Unfunded
		Qualified						Nonqualified						Other
		Retirement						Retirement						Postretirement
		Plan						Plan						Plans
	(Thousands of dollars)	2013			2012			2013			2012			2013			2012
	Change in benefit obligation
	Benefit obligation at beginning of period	$	42,716			36,736			9,299			4,294			12,542			11,297
	Service cost		1,549			1,630			143			364			450			455
	Interest cost		1,557			1,622			192			354			431			467
	Participant contributions		—			—			—			—			88			93
	Actuarial (gain)/loss		(7,672	)		3,853			(4,705	)		4,526			(2,466	)		566
	Benefits paid		(1,140	)		(1,125	)		(239	)		(239	)		(289	)		(336	)
	Benefit obligation at end of period	$	37,010			42,716			4,690			9,299			10,756			12,542
	Change in plan assets
	Fair value of plan assets at beginning of period	$	25,463			22,293			—			—			—			—
	Actual return on plan assets		5,237			2,322			—			—			—			—
	Employer contributions		1,200			2,100			239			239			201			243
	Participant contributions		—			—			—			—			88			93
	Benefits paid		(1,140	)		(1,125	)		(239	)		(239	)		(289	)		(336	)
	Expenses		(133	)		(127	)		—			—			—			—
	Fair value of plan assets at end of period	$	30,627			25,463			—			—			—			—
	Funded status of plans	$	(6,383	)		(17,253	)		(4,690	)		(9,299	)		(10,756	)		(12,542	)
	Amounts recognized in the balance sheet
	Current liability	$	—			—			(233	)		(236	)		(365	)		(410	)
	Noncurrent liability	$	(6,383	)		(17,253	)		(4,457	)		(9,063	)		(10,391	)		(12,132	)
	Deferred income taxes – net	$	2,504			6,587			1,840			3,313			4,219			4,702
	Accumulated other comprehensive (income)/loss	$	2,410			9,553			482			3,380			(213	)		1,170
	Amounts recognized in accumulated other comprehensive loss
	Net unrecognized (gain)/loss	$	3,942			15,677			799			5,579			(124	)		2,350
	Unrecognized prior service cost/(credit)		21			40			(7	)		(18	)		(245	)		(444	)
	Tax effects		(1,553	)		(6,164	)		(310	)		(2,181	)		156			(736	)
		$	2,410			9,553			482			3,380			(213	)		1,170
		Funded						Unfunded						Other
		Qualified						Nonqualified						Postretirement
		Retirement						Retirement						Plans
		Plan						Plan
	(Thousands of dollars)	2013			2012			2013			2012			2013			2012
	Assumptions used in measurement of benefit obligations
	Weighted average discount rate		4.84	%		3.94	%		4.84	%		3.94	%		4.85	%		3.9	%
	Rate of compensation increase		4	%		4	%		4	%		4	%		N/A			N/A
	Accumulated benefit obligations at year end	$	32,272			35,885			4,660			6,160			N/A			N/A
	Components of net periodic retirement expense and other postretirement benefits expense consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Funded qualified retirement plan
	Service cost	$	1,549			1,630			1,026
	Interest cost		1,557			1,622			1,471
	Expected return on plan assets		(1,894	)		(1,692	)		(1,657	)
	Amortization of prior service cost		18			18			18
	Amortization of actuarial loss		852			982			137
	Net periodic benefit cost	$	2,082			2,560			995
	Unfunded nonqualified retirement plan
	Service cost	$	143			364			67
	Interest cost		193			355			177
	Amortization of prior service credit		(11	)		(11	)		(11	)
	Amortization of actuarial loss		74			383			18
	Net periodic benefit cost	$	399			1,091			251
	Other postretirement benefits
	Service cost	$	450			455			350
	Interest cost		431			467			451
	Amortization of prior service credit		(199	)		(199	)		(199	)
Amortization of actuarial loss		8			73			—
Net periodic benefit cost	$	690			796			602
(Thousands of dollars)	2013			2012			2011
Assumptions used to determine net periodic benefit cost – pension plans
Weighted average discount rate		3.94	%		4.34	%		5.45	%
Expected long-term rate of return on plan assets		7.5	%		7.5	%		7.5	%
Rate of compensation increase		4	%		4	%		4	%
Assumptions used to determine net periodic benefit cost – other postretirement plan
Weighted average discount rate		3.9	%		4.3	%		5.35	%
Other changes in plan assets and benefit obligations recognized in other comprehensive (income)/loss
Net unrecognized loss/(gain)	$	(18,054	)		8,442			11,485
Amortization of prior service credit		(7	)		(7	)		(7	)
Amortization of actuarial losses		(934	)		(1,438	)		(155	)
Amortization of plan amendment		199			199			199
Tax effect of changes		7,372			(2,822	)		(4,519	)
Total recognized in other comprehensive (income)/loss	$	(11,424	)		4,374			7,003
(Thousands of dollars)	Funded			Unfunded			Other
	Qualified			Non-			Post-
	Retirement			qualified			retirement
	Plan			Retirement			Plan
				Plan
Estimated benefit payments by year
2014	$	1,277			233			365
2015		1,339			265			366
2016		1,398			260			379
2017		1,494			255			422
2018		1,609			250			466
2019 - 2023		10,604			1,562			3,042
The estimated net loss and net prior service cost for the defined benefit and supplemental retirement pension plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year are $54,000 and $10,000, respectively. The plan amendment for the other defined benefit postretirement plans that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year is $199,000.
The amount of projected expense of the qualified retirement plan is expected to be $1,207,000 for 2014. The Company expects to make contributions during 2014 of approximately $1,500,000 to the qualified retirement plan, $233,000 to fund benefits paid from its nonqualified retirement plan, and approximately $365,000 to fund postretirement benefit plans.
The discount rate assumption used by the Company to measure benefit obligations and net periodic expenses is based on the estimated interest rate at which the benefit obligations of its plans can be settled. For 2013 and 2012, the Company used a discount rate durational study of Other Postretirement Employee Benefit (“OPEB”) liabilities to determine an appropriate discount rate.
To develop the expected long-term rate of return on asset assumption, the Company considered the rates of return of assets the Company’s pension plan invested in and compared them to the historical rates of return on investments in similar assets. Further, these returns were compared to plans of other companies which had similar investment philosophies. After a review of the rate of inflation and its impact, management made the selection of the 7.50 percent assumption.
In determining the benefit obligation for health care at December 31, 2013, health care inflation cost was assumed to increase at an annual rate of five percent in 2013. Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plan. A one percentage-point increase in the assumed health care cost trend rate would increase the aggregate service and interest cost components of periodic benefit cost for 2013 by $169,000 and the benefit obligation by $1,704,000, while a one percentage-point decrease in the assumed rate would decrease the 2013 cost components by $133,000 and the benefit obligation by $1,362,000.
Funded Plan — The assets of the defined benefit plan, the “Plan”, are contained in a trust, sponsored by Deltic, and administered by a trustee appointed by the Company’s Pension Investment and Employees Benefits Committee.
The investment policy of the Plan is to achieve growth with the preservation of principal. To achieve the goal of growth of plan assets (excluding contributions and withdrawals) at a rate that exceeds inflation, a balanced portfolio consisting of equities, fixed income, alternative investments, and cash equivalents is maintained. The components of the portfolio should be securities that have readily available prices and can be sold easily without significantly impacting the price of the securities, with an exception for professionally managed hedge funds. The minimum and maximum asset allocation levels, in total are equities, 45 to 70 percent, fixed income, 25 to 55 percent, alternative investments, zero to 15 percent, and up to 5 percent in cash equivalents. Further, the total equity minimum and maximum allocation levels at market, for large cap equity is 40 to 60 percent, mid and small cap equity is 5 to 15 percent, and international equity is zero to 25 percent, with international emerging not to exceed 40 percent of international equities allocation.
Not more than 2.5 percent of the market value of Plan assets may be held in the securities of any single issuer with the exception of the U.S. government or its agencies. As of December 31, 2013, less than two percent of the total market value of the Plan assets was invested in collateralized mortgage obligations and asset-backed security issues.
The following types of securities are permitted in the Plan.
Equities	–		Common stocks, preferred stocks, convertible preferred stocks, convertible bonds, American depository receipts, proprietary funds, mutual funds, and exchange-traded funds.
Fixed income	–		U.S. government securities, corporate debt obligations, U.S. government agency securities, and mortgage-backed security issues, international bonds, and asset-backed securities.
Cash equivalents	–		U.S. government securities.
Alternative investments, hedge funds	–		Qualified fund of funds limited partnership shares or fund of funds in a mutual fund wrapper.
Fair Value Measurement — Following is a description of the valuation methodologies used for retirement plan assets measured at fair value.
Common stock, preferred securities, and exchange-traded funds: Valued at the closing price reported on the active market on which the individual securities are traded.
Mutual funds: Valued at the net asset value (“NAV”) of shares held by the Plan at year-end, at quoted market prices.
Alternative investment funds: Valued by company or industry source.
U.S. treasuries and government agency securities: Valued using quoted prices for similar assets in active markets.
Corporate debt obligations and U.S. government and agency securities: Valued using pricing models that utilize trade, bid, and other market information; or benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing.
Money market funds: Valued at par, which approximates fair value.
The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
Fair value measurement accounting establishes a fair value hierarchy based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets on identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants.
The following table sets forth by level within the fair value hierarchy, the Plan’s investments at fair value as of December 31, 2013.
	Fair Value Measurements at Reporting Date Using
(Thousands of dollars)	Percent			Total			Level 1			Level 2			Level 3
	of			Carrying
	Total			Value at
				Dec. 31,
				2013
Plan Investments
Cash and cash equivalents		3.2		$	984			984			—			—
Other		0.2			54			54			—			—
Equity securities by sector:
Energy		0.4			111			111			—			—
Materials and industrials		2.6			784			784			—			—
Consumer		4.7			1,435			1,435			—			—
Health care		2.5			771			771			—			—
Financials		0.8			259			259			—			—
Information tech		4.6			1.409			1,409			—			—
Foreign stocks		1			302			302			—			—
U.S. Govt. and agency securities		12.3			3,775			1,633			2,142			—
Corporate debt obligations		10.7			3,287			—			3,287			—
Mutual funds:
Dividends and growth		29.5			9,042			9,042			—			—
International and emerging markets		5.9			1,798			1,798			—			—
Exchange-traded funds		14.8			4,539			4,539			—			—
Alternative investment funds		6.8			2,077			—			—			2,077
Total plan investments at fair value		100		$	30,627			23,121			5,429			2,077
Percent of fair value hierarchy					100			75.5			17.7			6.8
The following table sets forth the activity in the Level 3 investments for the year ended December 31, 2013.
	Fair Value Measurements
	Using Significant
	Unobservable Inputs
	(Level 3)
(Thousands of dollars)	Alternative Investments
	Funds
Beginning balance at December 31, 2012	$	—
Actual return on plan assets:
Relating to assets still held at the reporting date		77
Purchases, sales, and settlements		2,000
Ending balance at December 31, 2013	$	2,077
The following table sets forth by level within the fair value hierarchy, the Plan’s investments at fair value as of December 31, 2012.
	Fair Value Measurements at Reporting Date Using
(Thousands of dollars)	Percent			Total			Level 1			Level 2			Level 3
	of			Carrying
	Total			Value at
				Dec. 31,
				2012
Plan Investments
Cash and cash equivalents		6.3		$	1,602			1,602			—			—
Other		0.2			55			55			—			—
Equity securities by sector:
Energy		1.2			293			293			—			—
Materials and industrials		4.1			1,054			1,054			—			—
Consumer		7.7			1,964			1,964			—			—
Health care		3.5			886			886			—			—
Financials		0.7			183			183			—			—
Information tech		9.2			2,339			2,339			—			—
Foreign stocks		1.6			415			415			—			—
U.S. Govt. and agency securities		18			4,568			2,369			2,199			—
Corporate debt obligations		13.1			3,332			—			3,332			—
Mutual funds:
Dividends and growth		26			6,610			6,610			—			—
International and emerging markets		3.7			954			954			—			—
Exchange-traded funds		4.7			1,208			1,208			—			—
Total plan investments at fair value		100		$	25,463			19,932			5,531			—
Percent of fair value hierarchy					100			78.3			21.7			—
Thrift Plan — Employees of the Company may participate in its thrift plan by allotting up to a specific percentage of their base pay. The Company matches contributions at a stated percentage of each employee’s allotment. Company contributions to this plan were $792,000 in 2013, $584,000 in 2012, and $598,000 in 2011.

Incentive_Plans

Incentive Plans	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Incentive Plans	'
	Note 17 – Incentive Plans
	Stock Incentive Plan
	On April 26, 2012, the Company’s shareholders approved an amendment to extend the Deltic Timber Corporation 2002 Stock Incentive Plan (“the 2002 Plan”) for ten years to April 26, 2022 and change the maximum number of shares which may be awarded in any calendar year as restricted stock and restricted stock units or other stock-based awards to 75,000 shares. The 2002 Plan replaced the 1996 Stock Incentive Plan (“the 1996 Plan”), which was terminated. The 2002 Plan permits annual awards of shares of the Company’s common stock to executives, other key employees, and nonemployee directors. Under the plan, the Executive Compensation Committee (“the Committee”) is authorized to grant: (1) stock options; (2) restricted stock and restricted stock units; (3) performance units; and (4)other stock-based awards, including stock appreciation rights and rights to dividends and dividend equivalents. The number of shares originally registered for issuance under the 2002 Plan was 1,800,000 shares. Additional shares may be issued if an adjustment is determined necessary by the committee as the result of dividend or other distribution, recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up, spin-off, combination, repurchase or exchange of common stock, or other corporate transaction in order to prevent dilution or enlargement of benefits or potential benefits intended to be made available. At December 31, 2013, 900,181 of these 1,800,000 shares were available for award under the 2002 Plan. No participant in the 2002 Plan may receive options and stock appreciation rights in any calendar year that relates to more than 50,000 shares, and the maximum number of shares, which may be awarded as restricted stock and restricted stock units or other stock-based awards are 75,000 shares. The Company has a policy of issuing treasury stock to satisfy all share-based incentive plans.
	Under the fair value recognition provisions for share-based payments, share-based compensation cost is estimated at the grant date based on the fair value of the award and is recognized as expense over the requisite service period of the award. The fair value of stock options granted is determined using a binomial model. The fair value of restricted stock awards is determined by reference to the fair market value of the Company’s common stock on the date of grant. Restricted stock performance units are valued using a Monte Carlo simulation model. Compensation cost is recognized on a straight-line basis over the requisite service period. The benefits of tax deductions in excess of recognized compensation cost is to be reported as a financing cash flow.
	Deltic issues restricted stock performance units whose vesting is contingent upon meeting certain financial performance goals based upon the Company’s total stockholder return compared to the total return of a Paper and Forest Products Index selected by the Committee and calculated by Standard and Poor’s. Determining the appropriate amount to expense is based on likelihood of achievement of the stated goals and requires judgment, including forecasting future financial results.
	The expected option term is based on the term of the option and historical exercise and expiration experience. The Company uses historical volatility over a ten-year trading life to determine weighted expected volatility assumptions. The expected dividend yield is based on the Company’s average dividend yield from 2009 to 2012. Risk-free interest rates are based on historical rates and forward-looking factors. The pre-vesting forfeiture rate is based on historical rates and forward-looking factors.
	Assumptions for the 2013, 2012, and 2011 valuation of stock options and restricted stock performance units consisted of the following:
		2013			2012			2011
	Expected term of options (in years)		6.27			6.27			6.27
	Weighted expected volatility		37.78	%		38.78	%		36.7	%
	Dividend yield		0.58	%		0.61	%		0.62	%
	Risk-free interest rate - performance restricted shares		0.6	%		0.6	%		2.09	%
	Risk-free interest rate - stock options		1.98	%		2	%		3.79	%
	Stock price as of valuation date	$	71.35			67.67			63.54
	Restricted performance share valuation	$	87.74			90.61			85.56
	Grant date fair value - stock options	$	26.2			24.92			20.89
	The consolidated statements of income for the years ended December 31, 2013, 2012, and 2011 included $2,797,000, $2,298,000, and $2,067,000, respectively, of stock-based compensation expense reflected in general and administrative expenses. The potential income tax benefit derived from all share-based payment arrangements with employees was $409,000, $607,000, and $759,000 for the years ended December 31, 2013, 2012, and 2011, respectively.
	Stock Options — For each option granted under the 2002 Plan, the Committee fixes the option price at not less than fair market value on the date of the grant and the option term, not to exceed ten years from date of grant. Options granted after 1998 have been issued with terms of ten years and are nonqualified. For all options granted since 2003, one-fourth vest after each one-year period over the subsequent four years from issuance. The resulting fixed stock-based compensation cost was recognized over the vesting period for these options. All outstanding options have an option price not less than the market value on the grant date, with a range in option prices of $32.57 to $71.35 per share.
	A summary of stock options as of December 31, 2013, and changes during the year ended are presented below:
		Shares			Weighted			Weighted			Aggregate
					Average			Average			Intrinsic
					Exercise			Remaining			Value
					Price			Contractual			$0
								Term (Years)
	Outstanding at January 1, 2013		125,920		$	54.92
	Granted		24,058			71.35
	Exercised		(17,979	)		42.26
	Forfeited/expired		(543	)		60.1
	Outstanding at December 31, 2013		131,456		$	59.64			6.4		$	1,174
	Exercisable at December 31, 2013		67,626		$	53.9			4.8		$	949
	The intrinsic value of options exercised during the years ended December 31, 2013, 2012, and 2011 was $513,000, $682,000, and $1,626,000, respectively. At December 31, 2013, there was $993,000 of unrecognized compensation cost related to nonvested stock options. The weighted average period remaining to vest is 1.5 years.
	Additional information about stock options outstanding at December 31, 2013, consisted of the following:
		Options Outstanding									Options Exercisable
	Range of Exercise Prices	Number			Average			Average			Number		Average
		of			Life in			Exercise			of		Exercise
		Options			Years			Price			Options		Price
	$31.00—$35.00		4,751			4.7		$	34.25			4,751	$	34.25
	$41.00—$45.00		17,274			6		$	44.83			10,309	$	44.82
	$51.00—$55.00		32,863			2.8		$	53			32,863	$	53
	$56.00—$65.00		26,371			7.1		$	63.54			13,194	$	63.54
	$66.00—$75.00		50,197			8.6		$	69.43			6,509	$	67.67
			131,456									67,626
	Restricted Stock and Restricted Stock Units — The Committee may grant restricted stock and restricted stock units to selected employees, with conditions to vesting for each grant established by the Committee. During the vesting period, the grantee may vote and receive dividends on the shares, but shares are subject to transfer restrictions and are all, or partially, forfeited if a grantee terminates, depending on the reason. Restricted stock and restricted stock units granted since 2003 have vested after four years, and the stock-based compensation is recognized on a straight-line basis over the requisite service period for the entire award.
	A summary of nonvested restricted stock as of December 31, 2013, and changes during the year then-ended are presented below:
		Shares			Weighted
					Average
					Grant-Date
					Fair Value
	Nonvested at January 1, 2013		76,352		$	52.09
	Granted		23,735			71.35
	Vested		(20,229	)		34.41
	Forfeited		(267	)		58.22
	Nonvested at December 31, 2013		79,591		$	62.31
	As of December 31, 2013, there was $2,292,000 of unrecognized compensation cost related to nonvested restricted stock. That cost is expected to be recognized over a weighted-average period of 1.7 years.
	Performance Units — Performance units granted under the 2002 Plan may be denominated in cash, common shares, other securities, other awards allowed under the 2002 Plan, or other property and shall confer on the holder thereof rights valued as determined by the Committee and payable to, or exercisable by, the holder, in whole or in part, upon achievement of such performance goals during such performance periods as the Committee shall establish. Subject to the terms of the 2002 Plan, the performance goals to be achieved during any performance period, the length of any performance period, the amount of any performance unit granted, and any payment or transfer to be made pursuant to any performance unit shall be determined by the Committee. During 2013, 2012, and 2011, the Company issued performance units in the form of restricted stock with specified performance requirements. During the vesting period, the grantee may vote and receive dividends on the shares, but shares are subject to transfer restrictions and are all, or partially, forfeited if a grantee terminates, depending on the reason. Performance units granted since 2003 have vested after four years, and the stock-based compensation is recognized on a straight-line basis over the requisite service period for the entire award.
	A summary of nonvested restricted stock performance units as of December 31, 2013, and changes during the year then-ended are presented below:
		Shares			Weighted
					Average
					Grant-Date
					Fair Value
	Nonvested at January 1, 2013		50,393		$	68.3
	Granted		16,427			87.74
	Vested		(13,892	)		43.48
Forfeited		(303	)		77.57
Nonvested at December 31, 2013		52,625		$	80.87
As of December 31, 2013, there was $1,963,000 of unrecognized compensation cost related to nonvested restricted stock performance units. That cost is expected to be recognized over a weighted-average period of 1.7 years.
Other Stock-based Awards — The Committee may also grant other awards, including but not limited to, stock appreciation rights and rights to dividends and dividend equivalents that are denominated, or payable in, valued in whole or in part by reference to, or otherwise based on or related to shares of the Company’s common stock, including securities convertible in its common stock, as deemed by the Committee to be consistent with the purpose of the 2002 Plan. No such other stock-based awards have been granted.
Cash Incentive Compensation Plan
The Company has an incentive compensation plan that provides for annual cash awards to officers and key employees based on actual results for a year compared to objectives established at the beginning of that year by the Executive Compensation Committee, which administers the Plan. The Company recorded expenses for cash incentive awards of $2,549,000, $2,014,000, and $71,000, in 2013, 2012, and 2011, respectively. The Company had accrued provisions for cash incentive awards totaling $2,631,000 and $1,973,000 at December 31, 2013 and 2012, respectively, reflected in the consolidated balance sheets in deferred revenues and other accrued liabilities.

Supplemental_Cash_Flows_Disclo

Supplemental Cash Flows Disclosures	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Cash Flows Disclosures	'
	Note 18 – Supplemental Cash Flows Disclosures
	Additional information concerning cash flows at December 31 consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Income taxes paid in cash	$	11,042			4,227			762
	Interest paid		3,547			3,571			3,607
	Interest capitalized		(53	)		(36	)		(82	)
	Non-cash investing and financing activities excluded from the statement of cash flows include:
	(Thousands of dollars)	2013			2012			2011
	Issuance of restricted stock	$	935			1,393			1,456
	Land exchanges		—			—			87
	(Increases)/decreases in operating working capital other than cash and cash equivalents, for each of the three years ended December 31 consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Trade accounts receivable	$	2,178			(457	)		(216	)
	Other receivables		(6	)		(12	)		97
	Inventories		(2,740	)		(541	)		1,708
	Prepaid expenses and other current assets		(184	)		963			(235	)
	Trade accounts payable		3,701			35			(585	)
	Accrued taxes other than income taxes		216			(19	)		(15	)
	Deferred revenues and other accrued liabilities		2,718			2,486			(1,674	)
		$	5,883			2,455			(920	)
	Cash flows provided by other operating activities included a decrease in deferred long-term mineral lease rental revenue of $1,635,000 in 2013, $1,767,000 in 2012, and $538,000 in 2011. Total cash payments received were $30,000 in 2013, $450,000 in 2012, and $1,932,000 in 2011. These payments will be recognized over the term of the lease.

Earnings_per_Share

Earnings per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings per Share	'
	Note 19 – Earnings per Share
	The amounts used in computing earnings per share and the effect on income and weighted average number of shares outstanding of dilutive potential common stock consisted of the following:
	(Thousands of dollars, except per share amounts)	2013		2012		2011
	Net earnings allocated to common stock	$	25,924		9,144		2,644
	Net earnings allocated to participating securities		268		91		15
	Net income allocated to common stock and participating securities	$	26,192		9,235		2,659
	Weighted average number of common shares used in basic EPS		12,566		12,525		12,450
	Effect of dilutive stock awards		58		63		102
	Weighted average number of common shares and dilutive potential common stock used in EPS assuming dilution		12,624		12,588		12,552
	Earnings per common share
	Basic	$	2.06		0.73		0.21
	Assuming dilution	$	2.05		0.73		0.21
	Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of common stock equivalents using the treasury stock method.
	The following table provides information about potentially dilutive securities that were outstanding but were not included in the computation of diluted earnings per share because they were anti-dilutive or, in the case of the restricted performance shares, did not meet the metrics established for awarding:
		2013		2012		2011
	Options		50,197		26,459		26,993
	Restricted performance shares		52,625		29,831		14,013

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 20 – Commitments and Contingencies
	Commitments — Commitments for capital expenditures at December 31, 2013, were approximately $3,978,000 for property, plant, and equipment; and $94,000 for investment in real estate held for development and sale and amenities.
	The Company is also involved in litigation incidental to its business from time to time. Currently, there are no other material legal proceedings outstanding.

Gain_on_Involuntary_Conversion

Gain on Involuntary Conversion	12 Months Ended
	Dec. 31, 2013
Gain (Loss) on Disposition of Property Plant Equipment [Abstract]	'
Gain on Involuntary Conversion	'
	Note 21 – Gain on Involuntary Conversion
	In December of 2012, four lumber storage sheds at the Company’s Ola Mill were destroyed due to an accumulation of snow and ice on their roofs. Insurance policies covered the replacement cost of these sheds, subject to deductibles. The Company received a total of $881,000 in payments from the insurance company for the year ended December 31, 2013. These payments were reported in operating income as a gain on involuntary conversion in the Consolidated Statements of Income and were used to fund capital expenditures to replace the storage sheds.

Business_Segments

Business Segments	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Business Segments	'
	Note 22 – Business Segments
	The Company’s four reporting segments consist of Deltic’s three operating business units and its corporate function. Each reporting entity has a separate management team and infrastructure that offers different products and/or services.
	Woodlands operations manage the Company’s Southern Pine timberlands located primarily in Arkansas and northern Louisiana and derive revenue from the harvest of timber from the timberlands in accordance with its harvest plans, and either sells timber to third parties in the domestic market or to the Company’s sawmills for conversion into lumber. In addition, this segment may, from time to time, identify and sell a portion of its timberland holdings that are either non-strategic to future timberland management activities or that have appreciated, due primarily to location, to a level that exceeds its value as a timber-growing asset. This segment also generates revenue from oil and gas royalties and the leasing of hunting, oil and gas, and other rights on its timberlands.
	The Manufacturing segment consists of Deltic’s two sawmills which convert timber into lumber and Del-Tin Fiber, a plant which converts sawmill residuals and an adhesive bond into MDF. The sawmills purchase timber from third parties or the Company’s Woodlands segment. The MDF plant purchases sawmill residuals from third parties and from the Company’s sawmills. The mills produce a variety of products, including dimension lumber, boards, and timbers, while the MDF plant produces several different grades of MDF. These products are sold primarily to wholesale distributors, large retailers, lumber treaters, industrial accounts, and truss manufacturers in the South and Midwest and are used in residential construction, roof trusses, remanufactured products, laminated beams, cabinets, flooring, and door parts.
	The Real Estate operations, which include three real estate developments, add value to former legacy timberland by developing it into upscale, planned residential and commercial developments. These developments, which are generally centered on a core amenity, are being developed in stages. Historically, real estate sales have consisted primarily of residential lots sold to builders or individuals, commercial site sales, and sales of undeveloped acreage. In addition, this segment currently leases retail and office space to third parties in a retail center constructed by the Company, and held for sale, in one of its developments. This segment also manages: (1) a real estate brokerage subsidiary which generates commission revenue by reselling existing homes and (2) a country club operation, Chenal Country Club, Inc., around which the Company’s Chenal Valley development is centered. This club operation derives its revenues from membership services, food and beverage sales, and membership dues.
	Corporate operations consist primarily of senior management, accounting, information systems, human resources, purchasing, treasury, income tax, and legal staff functions that provide support services to the operating business units. The Company currently does not allocate the cost of maintaining these support functions to its operating units.
	The accounting policies of the reportable segments are the same as those described in Note 1 – Significant Accounting Policies. The Company evaluates the performance of its segments based on operating income before results of: any equity method investee; interest income and expense; other non-operating income or expense; and income taxes. Intersegment revenues consist primarily of timber sales from the Woodlands segment to the sawmills operations (part of the Manufacturing segment) and are transferred at rates that approximate market for the respective operating area.
	Information about the Company’s business segments consisted of the following:
	(Thousands of dollars)		2013			2012			2011
	Net sales
	Woodlands		$	33,834			37,285			40,240
	Manufacturing2			167,955			105,956			83,889
	Real Estate			11,734			10,992			12,358
	Eliminations1			(13,821	)		(13,325	)		(14,640	)
			$	199,702			140,908			121,847
	Income before income taxes
	Operating income/(loss)
	Woodlands		$	16,749			18,374			20,416
	Manufacturing2			38,496			18,083			1,011
	Real Estate			(1,430	)		(2,099	)		(75	)
	Corporate			(17,994	)		(17,394	)		(14,293	)
	Eliminations			(158	)		168			400
	Operating income			35,663			17,132			7,459
	Equity in earnings of Del-Tin Fiber2			1,084			959			318
	Interest income			13			17			38
	Interest and other debt expense, net of capitalized interest			(4,578	)		(4,092	)		(4,029	)
	Gain on bargain purchase			3,413			—			—
	Other income			3,229			20			3
			$	38,824			14,036			3,789
	Total assets at year-end
	Woodlands		$	247,156			240,026			227,102
	Manufacturing2			85,837			30,136			33,801
	Real Estate			59,549			58,783			59,304
	Corporate3,4			18,802			24,264			21,663
			$	411,344			353,209			341,870
	Depreciation, amortization, and cost of fee timber harvested
	Woodlands		$	4,785			4,786			5,291
	Manufacturing2			9,910			5,378			5,999
	Real Estate			343			374			427
	Corporate			93			104			89
			$	15,131			10,642			11,806
	Capital expenditures
	Woodlands		$	12,755			18,553			7,817
	Manufacturing2			16,532			2,478			3,570
	Real Estate			4,267			2,996			4,223
	Corporate			14			7			87
			$	33,568			24,034			15,697
		1	Primarily intersegment sales of timber from Woodlands to Manufacturing.
		2	Del-Tin Fiber became a consolidated subsidiary, reported in the Manufacturing segment, upon acquisition of a controlling interest of its ownership effective April 1, 2013.
		3	Includes investment in Del-Tin Fiber, an equity method investee, of $6,293,000 and $7,113,000 at December 31, 2012, and 2011, respectively. (For additional information, see Note 4 – Business Combination.)
		4	Includes balance of timberland sale proceeds held by trustee, and there were none as of December 31, 2013, $7,000 as of December 31, 2012, and $567,000 in 2011.

Financial_Results_by_Quarter_U

Financial Results by Quarter (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Financial Results by Quarter (Unaudited)	'
	Note 23 – Financial Results by Quarter (Unaudited)
	(Thousands of dollars, except per share amounts)
			2013
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	41,563		53,247		56,520		48,372			199,702
	Gross profit			15,384		14,648		14,810		8,977			53,819
	Operating income			10,548		10,991		9,599		4,525			35,663
	Net income1			6,774		11,268		5,813		2,337			26,192
	Earnings per common share
	Basic		$	0.53		0.89		0.46		0.18			2.06
	Assuming dilution			0.53		0.88		0.46		0.18			2.05
	Dividends paid per common share2		$	0.1		0.1		0.1		0.1			0.4
			2012
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	30,639		37,105		36,499		36,665			140,908
	Gross profit			5,730		10,205		10,237		9,388			35,560
	Operating income			1,134		6,259		5,104		4,635			17,132
	Net income			97		3,516		3,218		2,404			9,235
	Earnings per common share
	Basic		$	0.01		0.28		0.25		0.19			0.73
	Assuming dilution			0.01		0.28		0.25		0.19			0.73
	Dividends paid per common share2		$	0.075		0.075		0.075		0.075			0.3
	(Thousands of dollars, except per share amounts)
			2011
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	29,395		32,268		31,371		28,813			121,847
	Gross profit			4,896		6,856		5,847		5,117			22,716
	Operating income			550		3,587		2,116		1,206			7,459
	Net income/(loss)			92		2,055		720		(208	)		2,659
	Earnings per common share
	Basic		$	0.01		0.16		0.06		(.02	)		0.21
	Assuming dilution			0.01		0.16		0.06		(.02	)		0.21
	Dividends paid per common share2		$	0.075		0.075		0.075		0.075			0.3
	1	Del-Tin Fiber, formerly an equity investment, became a consolidated subsidiary effective April 1, 2013. Net income for the second quarter of 2013 includes a gain on bargain purchase of $3,285,000 and a gain on previously held equity investment of $3,165,000. The fourth quarter includes additional bargain gain recognized of $128,000, for a total of $3,413,000 for the year. (For additional information, see Note 4 – Business Combinations.)
	2	Payment of dividends is the means by which Deltic Timber Corporation makes distributions to its shareholders of profits and cash flows generated by the Company’s business operations. These dividends are declared by the Company’s Board of Directors on a quarterly basis. The Company’s dividend strategy is to grow the amount of the dividend over time, at a rate of increase that is believed to be sustainable. The timing and amount of future increases are based on the estimated trend for future earnings and cash flow, taking into account other potential uses of the Company’s capital resources including, but not limited to, acquisition opportunities, capital expenditures for existing operations, debt repayments, and repurchases of the Company’s common stock.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Description of Business	'
	Description of Business — Deltic Timber Corporation (“Deltic” or the “Company”) is a natural resources company engaged primarily in the growing and harvesting of timber and the manufacture and marketing of lumber and medium density fiberboard (“MDF”). Deltic owns approximately 458,600 acres of timberland, primarily in Arkansas and north Louisiana. The Company’s sawmill operations are located at Ola in central Arkansas and at Waldo in south Arkansas, and the MDF plant is located near El Dorado, Arkansas. In addition to its timber, lumber, and MDF operations, the Company is engaged in real estate development in central Arkansas.
Business Environment	'
	Business Environment — The Company is primarily a wood products producer operating in a commodity-based business environment with a major diversification in real estate development. This environment is affected by a number of factors including general economic conditions, interest rates, credit availability, building product imports, foreign exchange rates, housing starts, new and existing housing inventory, foreclosures, residential repair and remodeling, commercial construction and repair, industry capacity and production levels, the availability of contractors for logging, hauling, and shipping, the availability of raw materials, natural gas pricing, costs of fuel, and weather conditions.
Principles of Consolidation	'
	Principles of Consolidation — The consolidated financial statements of Deltic Timber Corporation include the accounts of Deltic, all majority-owned subsidiaries, and any variable interest entities of which it is the primary beneficiary. Equity investments and joint ventures are accounted for under the equity method if it is determined that the Company does not have control of the entity. Significant intercompany transactions and accounts have been eliminated.
Business Combination	'
	Business Combination — The Company accounts for business combinations using the acquisition method. The assets acquired and liabilities assumed are measured at fair value on the acquisition date using appropriate valuation methods. The operations of the acquisitions are included in the consolidated financial statements from the date of acquisition. (For additional information, see Note 4 – Business Combinations.)
Use of Estimates	'
	Use of Estimates — In the preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States of America, management has made a number of estimates and assumptions related to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities. Actual results may differ from those estimates.
Cash Equivalents	'
	Cash Equivalents — Cash equivalents include investments that have a maturity of three months or less from the date of purchase.
Accounts Receivable and Allowance for Doubtful Accounts	'
	Accounts Receivable and Allowance for Doubtful Accounts — The Company records trade accounts receivable at net realizable value. This value includes an appropriate allowance for estimated uncollectible accounts to reflect any loss anticipated on the trade accounts receivable balances and charged to the provision for doubtful accounts. The allowance is based upon review of specific receivables outstanding and considers factors such as current overall economic conditions, industry-specific economic conditions, historical customer performance, and anticipated customer performance. In the consolidated statements of income, bad debt expense is included in cost of sales. Charges to bad debt expense were $158,000, $133,000, and $63,000 in 2013, 2012, and 2011, respectively. At December 31, 2013 and 2012, the balance in the allowance account was $172,000 and $127,000, respectively.
Inventories	'
	Inventories — Inventories of logs, wood fiber, lumber, MDF, and supplies are stated at the lower of cost or market within Deltic’s operating areas, primarily using the average cost method. Log costs include harvest and transportation cost as appropriate. Lumber and MDF costs include materials, labor, and production overhead. (For additional information, see Note 2 – Inventories.)
Investment in Del-Tin Fiber	'
	Investment in Del-Tin Fiber — On April 1, 2013, the Company acquired the remaining 50 percent membership interest of Del-Tin Fiber L.L.C., which had been accounted for as an equity method investment and is now included as a wholly-owned consolidated subsidiary. (For additional information, see Note 4 – Business Combinations.)
Investment in Real Estate Held for Development and Sale	'
	Investment in Real Estate Held for Development and Sale — Real estate held for development and sale includes direct costs of land and land development and indirect cost, including amenities. Indirect and amenity costs are allocated to individual lots or acreage sold based on relative retail sales value. Direct costs are allocated to a specific neighborhood or commercial real estate tract, while indirect costs for the Company’s three developments – Chenal Valley, Chenal Downs, and Red Oak Ridge – are allocated to neighborhoods over the entire respective development area based on relative retail sales values.
Timber and Timberlands	'
	Timber and Timberlands — Timber and timberlands, which includes timberland, fee timber, purchased stumpage inventory, and logging facilities, are stated at cost, less the cost of fee timber harvested and accumulated depreciation of logging facilities, and include no estimated future reforestation cost. The cost of timber consists of fee timber acquired and reforestation costs, which includes site preparation, seedlings, and labor. The cost of fee timber harvested is based on the volume of timber harvested in relation to the estimated volume of timber recoverable. Logging facilities, which consist primarily of roads constructed and other land improvements, are depreciated using the straight-line method over a ten-year estimated life. The Company estimates its fee timber inventory using statistical information and data obtained from physical measurements and other information gathering techniques. Fee timber carrying costs, commercial thinning, silviculture, and timberland management costs are expensed as incurred.
	The Company classifies its timberlands and fee timber as either strategic or non-strategic. Strategic timberland, including pine forest and pine plantations, is prime pine sawtimber growing platforms located within or immediately adjacent to the Company sawmills’ operating regions. Deltic manages these acres using modern silviculture methods to achieve optimal volume and quality of its pine sawtimber. The Company harvests sawtimber and pulpwood in accordance with its harvest plans and generally converts sawtimber into lumber in its own sawmills and sells pulpwood in the market. Upon harvest, strategic timberlands are reforested. The Company’s timberland acquisition program is focused on the acquisition of pine-growing timberland in its current operating regions. The Company considers the acquisition and the occasional sale of strategic timberlands as investing activities. The Company has legacy hardwood and other acreage which cannot be harvested for conversion in Company sawmills, reforested as pine plantations, or managed efficiently using modern silviculture methods either due to the size of the tract or lack of proximity to other Deltic fee timberlands. These timberlands have been identified as non-strategic and/or higher and better use timberlands and are expected to be sold over time. The Company considers these sales to be an operating activity of its Woodlands segment.
	In order to acquire and sell assets, primarily timberlands, in a tax efficient manner, the Company enters into tax-deferred, like-kind exchange (“LKE”) transactions when possible. The Company generally enters into forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property, and reverse transactions, in which property is acquired and similar property is subsequently sold. A qualified LKE intermediary is used to facilitate LKE transactions. Proceeds from forward LKE transactions are held by the intermediary and are classified as restricted cash because the funds must be reinvested in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the company-owned property, the proceeds are distributed to Deltic by the intermediary and are reclassified as available cash, and applicable income taxes are determined. Amounts deposited with a third party towards the potential future purchase of property are included in deferred charges and other assets in the consolidated balance sheets and as an investing activity as changes in funds held by trustee in the consolidated statements of cash flows. At December 31, 2013, the Company had no proceeds from land sales deposited with an LKE intermediary and had $7,000 deposited at December 31, 2012. An exchange accommodation titleholder, a type of variable interest entity, is used to facilitate reverse like-kind exchanges. The acquired assets are held by the exchange accommodation titleholder until the exchange transactions are complete. If the Company determines that it is the primary beneficiary of the exchange accommodation titleholder, Deltic includes the assets held by the exchange accommodation titleholder in timber and timberlands assets on the consolidated balance sheets and recognizes any income or expense attributed to the property in the consolidated income statements.
Property, Plant, and Equipment	'
	Property, Plant, and Equipment — Property, plant, and equipment assets are stated at cost less accumulated depreciation. Depreciation of buildings, equipment, and other depreciable assets is calculated primarily using the straight-line method. Expenditures that substantially improve and/or increase the useful life of facilities or equipment are capitalized. Maintenance and repair costs are expensed as incurred. Gains and losses on disposals or retirements are recognized in the period they occur.
	Property, plant, and equipment assets are evaluated for possible impairment on a specific asset basis or in groups of similar assets, as applicable, whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future net cash flows to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment loss is recognized for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell, and depreciation ceases.
Revenue Recognition	'
	Revenue Recognition — The Company recognizes revenue when the following criteria are met:
	(1) persuasive evidence of an agreement exists, (2) delivery has occurred or services have been rendered, (3) the price to the buyer is fixed and determinable, and (4) collectability is reasonably assured. Delivery is not considered to have occurred until the customer takes title and assumes the risks and rewards of ownership. Revenue from the sale of lumber, MDF, and wood by-products is recorded at the time of shipment due to terms of such sale being designated free on board (“f.o.b.”) shipping point. Revenue from consignment sales are recorded when the customer assumes ownership of the product. Revenue from the sale of timber-cutting rights to third parties is recorded when legal title passes to the purchaser, which is generally upon delivery of a legally executed timber deed and receipt of payment for the timber. Revenue from intersegment timber sales is recorded when the timber is harvested; such intersegment sales, which are made at prices which generally approximate market within Deltic’s operating area, are eliminated in the consolidated financial statements.
	Revenue from the leasing of land for hunting purposes is deferred when received and subsequently recognized over the one-year lease term, which begins September 1 of each year. At December 31, 2013 and 2012, the Company had deferred hunting lease revenue totaling $1,684,000 and $1,562,000, respectively, reflected in the consolidated balance sheets in deferred revenues and other accrued liabilities. Revenue from mineral lease rental payments is deferred when received and recognized ratably over the lease term. At December 31, 2013 and 2012, the Company had deferred mineral lease revenue of $2,085,000 and $3,721,000, respectively, of which $649,000 and $2,064,000 is included in other noncurrent liabilities for 2013 and 2012, respectively, and $1,436,000 and $1,657,000 is included in other current liabilities, respectively. Mineral royalty payments are
	recognized when received. Revenue from sales of timberland and real estate is recorded when the sale is closed and legal title is transferred and the buyer’s initial and continuing investment is adequate, which is generally at the time the purchaser executes the real estate closing documents and makes payment to the title company handling the closing.
Income Taxes	'
	Income Taxes — The Company uses the asset and liability method of accounting for income taxes. Under this method, the provision for income taxes includes amounts currently payable and amounts deferred as tax assets and liabilities, based on differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities, and is measured using the enacted tax rates that are expected to be in effect when the differences reverse. Deferred tax assets are reduced by a valuation allowance, which is established when it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized. The effect on deferred tax assets and liabilities of a change in tax law is recognized in income in the period that includes the enactment date. The Company continuously reviews state and federal tax returns for uncertain tax provisions. Tax benefits are recorded if it is more-likely-than-not that the positions will be sustained upon examination by the taxing authorities, and liabilities are recorded if it is deemed less likely that the position taken would prevail. These liabilities are adjusted in the period in which it is determined that the issue is settled with the relevant taxing authority, the expiration of statute of limitation for a tax year in question, a change in tax laws, or other facts become known.
Property Taxes	'
	Property Taxes — Property taxes applicable to the Company’s assets are estimated and accrued in the period of assessment. At December 31, 2013 and 2012, the Company had accrued property tax expense totaling $1,798,000 and $1,783,000, respectively, reflected in the consolidated balance sheets in accrued taxes other than income taxes.
Share-Based Compensation	'
	Share-Based Compensation — The Company applies a fair value-based measurement method in accounting for share-based payment transactions with employees, recognizing the cost as the services are performed. (For additional information, see Note 17 – Incentive Plans.)
Pensions and Other Postretirement Benefits	'
	Pensions and Other Postretirement Benefits — The Company sponsors both qualified and nonqualified, noncontributory, defined benefit retirement plans that cover all eligible employees, excluding employees of the subsidiaries. Benefits are based on years of service and final career-average-pay formulas as defined by the plans. The qualified plan is funded to accumulate sufficient assets to provide for accrued benefits. The nonqualified plan, a supplemental executive plan, is not funded; payments to retirees due under this plan are made on a monthly basis.
	The Company also sponsors a defined benefit health care plan and a life insurance benefit plan for all eligible retired employees, excluding employees of the subsidiaries. The Company measures the costs of its obligations for these plans based on its health care cost trends and actuarial assumptions, including discount rates, mortality rates, assumed rates of return, compensation increases, and turnover rates. The Company reviews its assumptions on an annual basis and makes modifications to the assumptions based on current rates and trends when it is appropriate to do so. The effect of modifications to those assumptions is recorded in accumulated other comprehensive income/(loss) and amortized to net periodic cost over future periods using the corridor method. The Company believes that the assumptions utilized in recording its obligations under its plans are reasonable based on its experience and market conditions.
	Net periodic costs are recognized as employees render the services necessary to earn these post retirement benefits. (For additional information, see Note 16 – Employee and Retiree Benefit Plans.)
Advertising Costs	'
	Advertising Costs — Advertising costs, primarily related to marketing efforts for the Company’s real estate developments, are expensed as incurred. These costs amounted to $716,000 in 2013, $732,000 in 2012, and $768,000 in 2011, and are reflected in the consolidated statements of income.
Capitalized Interest	'
	Capitalized Interest — The Company capitalizes interest for qualifying assets during construction by applying the Company’s capitalization rate to the average amount of accumulated expenditures for the asset during the period. Interest is most often capitalized as an indirect cost for real estate development in the Company’s real estate operations. (For additional information, see Note 18 – Supplemental Cash Flows Disclosures.)
Capital Expenditures	'
	Capital Expenditures — Capital expenditures include additions to investment in real estate held for development and sale; timber and timberlands; and property, plant, and equipment.
Net Change in Purchased Stumpage Inventory	'
	Net Change in Purchased Stumpage Inventory — Purchased stumpage inventory consists of timber-cutting rights purchased from third parties specifically for use in the Company’s sawmills. Depending on the timing of acquisition and usage of this acquired stumpage inventory, the net change in this inventory can either be a source or use of cash in the Company’s consolidated statements of cash flows.
Earnings per Common Share	'
	Earnings per Common Share — Basic earnings per share is computed using the two-class method and is based on earnings available to common shareholders less accrued preferred dividends, if any, and the weighted average number of common shares outstanding. The diluted earnings per share amounts are computed based on earnings available to common shareholders and the weighted average number of common shares outstanding, including shares assumed to be issued under the Company’s stock incentive plans using the treasury-stock method, unless anti-dilutive. (For a reconciliation of amounts used in per share computations, see Note 19 – Earnings per Share.)
Shipping and Handling Costs	'
	Shipping and Handling Costs — Shipping and handling costs, such as freight to our customers’ destinations, are included in cost of sales in the Company’s consolidated statements of income. These costs, when included in the amount invoiced to customers, are also recognized in net sales.
Off-Balance Sheet Arrangements	'
	Off-Balance Sheet Arrangements — The Company evaluates its transactions to determine if any variable interest entities exist. If it is determined that Deltic is the primary beneficiary of a variable interest entity, that entity is consolidated into Deltic’s financial statements.
Effect of Recently Issued Authoritative Accounting Guidance	'
	Effect of Recently Issued Authoritative Accounting Guidance — Financial Accounting Standards Update No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Topic 220),” became effective for the Company on January 1, 2013. The amendment of this update requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component including the respective line item of net income when reclassed in its entirety. (For additional information, refer to Note 15 – Other Comprehensive Income Disclosures.)
Subsequent Events	'
	Subsequent Events — The Company has evaluated subsequent events through the date the financial statements were issued.

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Raw materials   - Logs	$	1,612		1,341
	- Del-Tin – wood fiber		440		—
	Finished goods  - Lumber		4,145		3,231
	- Medium density fiberboard		3,110		—
	- Medium density fiberboard consigned to others		708		—
	Supplies		2,424		322
		$	12,439		4,894

Prepaid_Expenses_and_Other_Cur1

Prepaid Expenses and Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Prepaid Expense and Other Assets Current [Abstract]	'
Prepaid Expenses and Other Current Assets	'
	Prepaid expenses and other current assets at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Short-term deferred tax assets	$	1,901		2,074
	Refundable income taxes		109		123
	Prepaid expenses		692		88
	Other current assets		453		523
		$	3,155		2,808

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Purchase Price Allocated to Net Tangible and Intangible Assets	'
	The purchase price allocated to the net tangible and intangible assets acquired and liabilities assumed based on their fair values as of the acquisition date and the calculation of the gain on bargain purchase were as follows:
	(Thousands of dollars)
	Accounts receivable		$	4,229
	Inventories			4,805
	Other current assets			360
	Property, plant, and equipment			40,960
	Intangible assets1			1,700
	Other assets			171
	Current liabilities			(1,653	)
	Deferred tax liabilities			(2,203	)
	Long-term liabilities			(29,000	)
	Net assets acquired			19,369
	Cash paid			(5,170	)
	Fair value of previously held investment in Del-Tin Fiber			(10,786	)
	Gain on bargain purchase		$	3,413
	1	The acquired intangible assets consist of internally developed software which is being amortized over three years.
Summarizes Combined Results of Operations on Pro Forma Basis	'
	This information is based on historical results of operations, adjusted for certain acquisition accounting adjustments and does not purport to represent Deltic Timber’s actual results of operation as if the acquisition transaction described above would have occurred as of January 1, 2012, nor is it necessarily indicative of future results.
			Twelve Months Ended
			December 31,
	(Thousands of dollars, except per share amounts)		2013			2012
	Net sales		$	217,268		$	207,446
	Net income			21,193			8,846
	Basic earnings per common share			1.69			0.71
	Diluted earnings per common share			1.68			0.7

Timber_and_Timberlands_Tables

Timber and Timberlands (Tables)	12 Months Ended
	Dec. 31, 2013
Timber and Timberlands [Abstract]	'
Summary of Timber and Timberlands	'
	Timber and timberlands at December 31 consisted of the following:
	(Thousands of dollars)	2013			2012
	Purchased stumpage inventory	$	2,388			902
	Timberlands		102,609			99,159
	Fee timber		253,768			246,105
	Logging facilities		2,628			2,601
			361,393			348,767
	Less accumulated cost of fee timber harvested and facilities depreciation		(113,056	)		(108,873	)
	Strategic timber and timberlands		248,337			239,894
	Non-strategic timber and timberlands		496			321
		$	248,833			240,215

Property_Plant_and_Equipment_T

Property, Plant, and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant, and Equipment	'
	Property, plant, and equipment at December 31 consisted of the following:
	(Thousands of dollars)	Range of	2013			2012
		Useful Lives
	Land	N/A	$	947			357
	Land improvements	10-20 years		8,835			6,322
	Buildings and structures	10-20 years		22,599			13,985
	Machinery and equipment	3-15 years		145,741			99,867
				178,122			120,531
	Less accumulated depreciation			(102,863	)		(93,863	)
			$	75,259			26,668

Deferred_Revenues_and_Other_Ac1

Deferred Revenues and Other Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Payables And Accruals [Abstract]	'
Deferred Revenues and Other Accrued Liabilities	'
	Deferred revenues and other accrued liabilities at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Deferred revenues – current	$	3,697		3,794
	Vacation accrual		1,290		971
	Deferred compensation		3,442		2,720
	All other current liabilities		1,901		1,609
		$	10,330		9,094

Other_Noncurrent_Liabilities_T

Other Noncurrent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Payables And Accruals [Abstract]	'
Other Noncurrent Liabilities	'
	Other noncurrent liabilities at December 31 consisted of the following:
	(Thousands of dollars)	2013		2012
	Accumulated postretirement benefit obligation	$	10,391		12,132
	Excess retirement plan		4,457		9,063
	Accrued pension liability		6,383		17,254
	Deferred revenue – long-term portion		649		2,064
	Uncertain tax positions liability		1,185		1,325
	All other noncurrent payables		2,678		2,644
		$	25,743		44,482

Indebtedness_Tables

Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Company's Indebtedness	'
	The Company’s indebtedness at December 31 consisted of the following:
	(Thousands of dollars)		2013			2012
	Notes payable, 1.54%*, due 2018 (See Note 9 – Credit Facilities)		$	21,000			23,000
	Senior notes payable, 6.10%, due 2016			40,000			40,000
	Union County, Arkansas Taxable Industrial Revenue Bonds, .31%, due 2027			29,000			—
	Long-term debt		$	90,000			63,000
		*	Weighted average interest rate at December 31, 2013.
Ratio Requirements for Credit Facility and Senior Notes Payable	'
	The table below sets forth the most restrictive ratio requirements of the covenants for the credit facility and Senior Notes Payable and the status with respect to these covenants as of December 31, 2013 and 2012.
			Covenants			Actual Ratios at			Actual Ratios at
			Requirements			Dec. 31, 2013			Dec. 31, 2012
	Leverage ratio should be less than:1			.60 to 1			.254 to 1			.253 to 1
	Total outstanding debt as a percentage of total debt allowed based on the minimum timber market value covenant:2			—	2		48.24	%		44.15	%
	Fixed charge coverage ratio should be greater than:3			2.50 to 1			10.04 to 1			5.39 to 1
	1	The leverage ratio is calculated as total debt divided by total capital. Total debt includes indebtedness for borrowed money, secured liabilities, obligations in respect of letters of credit, and guarantees. Total capital is the sum of total debt and net worth. Net worth is calculated as total assets minus total liabilities, as reflected on the balance sheet. This covenant is applied at the end of each quarter. The revolving credit facility requirement is for the leverage ratio to be less than .65 to 1.
	2	Timber market value must be greater than 200 percent of total debt (as defined in (1) above.) The timber market value is calculated by multiplying the average price received for sales of timber for the preceding four quarters by the current quarter’s ending inventory of timber. This covenant is applied at the end of the quarter on a rolling four-quarter basis. The revolving credit facility requirement is for the timber market value to be greater than 175 percent of total debt (as defined in (1) above.)
	3	The fixed charge coverage ratio is calculated as EBITDA (earnings before interest, taxes, depreciation, depletion, and amortization) increased by non-cash compensation expense and other non-cash expenses and decreased by dividends paid and income tax paid, divided by the sum of interest expense and scheduled principal payments made on debt during the period. This covenant is applied at the end of the quarter on a rolling four-quarter basis. This covenant only applies to the Senior Notes Payable.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense/(Benefit)	'
	The components of income tax expense/(benefit) related to income from operations for the years ended December 31, 2013, 2012, and 2011 are as follows:
	(Thousands of dollars)	2013			2012			2011
	Federal
	Current	$	10,237			4,743			930
	Deferred		138			(685	)		1
			10,375			4,058			931
	State
	Current		2,154			707			(909	)
	Deferred		103			36			1,108
			2,257			743			199
	Total income tax expense	$	12,632			4,801			1,130
Schedule of Reconciliation of Income Tax Expense	'
	The following table provides a reconciliation of the Company’s income tax expense at the statutory U.S. federal rate of 35 percent to the actual income tax expense for the years ended December 31, 2013, 2012, and 2011.
	(Thousands of dollars)	2013			2012			2011
	U.S. Federal income tax using statutory tax rate	$	13,588			4,913			1,326
	State tax, net of federal tax benefit		1,458			446			160
	Permanent differences		(1,219	)		(558	)		(306	)
	Tax effects resulting from:
	Gain on bargain purchase		(1,195	)		—			—
	Other		—			—			(50	)
	Income tax provision as reported	$	12,632			4,801			1,130
Schedule of Deferred Tax Assets and Deferred Tax Liabilities	'
	The Company’s deferred tax assets and deferred tax liabilities at December 31, 2013 and 2012, consisted of the following:
	(Thousands of dollars)	2013			2012
	Deferred tax assets
	Investment in real estate held for development and sale	$	16,914			16,560
	Postretirement and other employee benefits		13,435			19,652
	Other deferred tax assets		2,360			2,942
	Total deferred tax assets		32,709			39,154
	Deferred tax liabilities
	Investment in Del-Tin Fiber		—			(5,246	)
	Timber and timberlands		(26,158	)		(25,520	)
	Property, plant, and equipment		(11,838	)		(3,797	)
	Other deferred tax liabilities		(326	)		(151	)
	Total deferred tax liabilities		(38,322	)		(34,714	)
	Net deferred tax assets/(liabilities)	$	(5,613	)		4,440
Schedule of Deferred Tax Assets and Liabilities Classified in Accompanying Consolidated Balance Sheets	'
	The deferred tax assets and liabilities are classified in the accompanying consolidated balance sheets as follows:
	(Thousands of dollars)	2013			2012
	Current tax assets	$	1,901			2,074
	Long-term tax assets		—			2,837
	Long-term tax liabilities		(7,514	)		(471	)
	Net deferred tax assets/(liabilities)	$	(5,613	)		4,440
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding both interest and any related federal benefits) is as follows:
	(Thousands of dollars)	2013			2012
	Balance at January 1	$	1,331			1,774
	Lapse of statute		(146	)		(443	)
	Balance at December 31	$	1,185		$	1,331

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements for Financial Liabilities Accounted on a Recurring Basis	'
	The fair value measurements for the Company’s financial liabilities accounted for at fair value on a recurring basis at December 31, 2013 are presented in the following table:
				Fair Value Measurements at Reporting Date Using
		December 31,		Quoted Prices in		Significant		Significant
				Active Markets for		Observable		Unobservable
				Identical		Inputs		Inputs
				Liabilities Inputs
	(Thousands of dollars)	2013		Level 1		Level 2		Level 3
	Liabilities
	Nonqualified employee savings plan	$	1,353		1,353		—		—
Carrying Amounts and Estimated Fair Values of Financial Instruments	'
	The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2013 and 2012. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes financial instruments included in current assets and liabilities, except current maturities of long-term debt, all of which have fair values approximating carrying values.
		2013				2012
	(Thousands of dollars)	Carrying		Estimated		Carrying		Estimated
		Amount		Fair Value		Amount		Fair Value
	Financial liabilities
	Long-term debt, including current liabilities	$	90,000		94,534		63,000		68,029

Other_Comprehensive_Income_Dis1

Other Comprehensive Income Disclosures (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Changes in Accumulated Other Comprehensive Loss by Component (Net of Tax)	'
	Changes in Accumulated Other Comprehensive Loss by Component (Net of Tax)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2013	$	(9,553	)		(3,380	)		(1,170	)		(14,103	)
	Amounts reclassified from AOCL		529			38			(116	)		451
	Net gain arising during period		6,614			2,860			1,499			10,973
	Net current period other comprehensive income		7,143			2,898			1,383			11,424
	AOCL at December 31, 2013	$	(2,410	)		(482	)		213			(2,679	)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2012	$	(8,124	)		(855	)		(750	)		(9,729	)
	Amounts reclassified from AOCL		608			226			(77	)		757
	Net loss arising during period		(2,037	)		(2,751	)		(343	)		(5,131	)
	Net current period other comprehensive loss		(1,429	)		(2,525	)		(420	)		(4,374	)
	AOCL at December 31, 2012	$	(9,553	)		(3,380	)		(1,170	)		(14,103	)
	(Thousands of dollars)	Defined			Defined			Post			Total
		Benefit			Benefit			Retirement
		Funded			Unfunded			Benefit
		Retirement			Retirement			Plan
		Plan			Plan
	AOCL at January 1, 2011	$	(2,638	)		(304	)		216			(2,726	)
	Amounts reclassified from AOCL		94			4			(121	)		(23	)
	Net loss arising during period		(5,580	)		(555	)		(845	)		(6,980	)
	Net current period other comprehensive loss		(5,486	)		(551	)		(966	)		(7,003	)
	AOCL at December 31, 2011	$	(8,124	)		(855	)		(750	)		(9,729	)
Reclassification Out of Accumulated Other Comprehensive Loss	'
	Tax Effects by Component
		For the Year Ended December 31, 2013
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	18,054			(7,081	)		10,973
	Amortization of prior service costs		7			(3	)		4
	Amortization of actuarial losses/(gains)		934			(366	)		568
	Amortization of plan amendment		(199	)		78			(121	)
		$	18,796			(7,372	)		11,424
		For the Year Ended December 31, 2012
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	(8,442	)		3,311			(5,131	)
	Amortization of prior service costs		7			(3	)		4
	Amortization of actuarial losses/(gains)		1,438			(564	)		874
	Amortization of plan amendment		(199	)		78			(121	)
		$	(7,196	)		2,822			(4,374	)
	Tax Effects by Component (cont.)
		For the Year Ended December 31, 2011
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	(11,485	)		4,505			(6,980	)
	Amortization of prior service costs	$	7			(3	)		4
	Amortization of actuarial losses/(gains)		155			(61	)		94
	Amortization of plan amendment		(199	)		78			(121	)
		$	(11,522	)		4,519			(7,003	)
Tax Effects by Component	'
	Tax Effects by Component
		For the Year Ended December 31, 2013
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	18,054			(7,081	)		10,973
	Amortization of prior service costs		7			(3	)		4
	Amortization of actuarial losses/(gains)		934			(366	)		568
	Amortization of plan amendment		(199	)		78			(121	)
		$	18,796			(7,372	)		11,424
		For the Year Ended December 31, 2012
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	(8,442	)		3,311			(5,131	)
	Amortization of prior service costs		7			(3	)		4
	Amortization of actuarial losses/(gains)		1,438			(564	)		874
	Amortization of plan amendment		(199	)		78			(121	)
		$	(7,196	)		2,822			(4,374	)
	Tax Effects by Component (cont.)
		For the Year Ended December 31, 2011
	(Thousands of dollars)	Before			Tax			Net of
		Tax			(Expense)			Tax
		Amount			or Benefit			Amount
	Gains/(losses) arising during the period	$	(11,485	)		4,505			(6,980	)
	Amortization of prior service costs	$	7			(3	)		4
	Amortization of actuarial losses/(gains)		155			(61	)		94
	Amortization of plan amendment		(199	)		78			(121	)
		$	(11,522	)		4,519			(7,003	)

Employee_and_Retiree_Benefit_P1

Employee and Retiree Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Plan Benefit Obligations, Fair Value of Plan Assets, and Funded Status	'
	The following table sets forth the plans’ benefit obligations, fair value of plan assets, and funded status at December 31, 2013 and 2012.
		Funded						Unfunded
		Qualified						Nonqualified						Other
		Retirement						Retirement						Postretirement
		Plan						Plan						Plans
	(Thousands of dollars)	2013			2012			2013			2012			2013			2012
	Change in benefit obligation
	Benefit obligation at beginning of period	$	42,716			36,736			9,299			4,294			12,542			11,297
	Service cost		1,549			1,630			143			364			450			455
	Interest cost		1,557			1,622			192			354			431			467
	Participant contributions		—			—			—			—			88			93
	Actuarial (gain)/loss		(7,672	)		3,853			(4,705	)		4,526			(2,466	)		566
	Benefits paid		(1,140	)		(1,125	)		(239	)		(239	)		(289	)		(336	)
	Benefit obligation at end of period	$	37,010			42,716			4,690			9,299			10,756			12,542
	Change in plan assets
	Fair value of plan assets at beginning of period	$	25,463			22,293			—			—			—			—
	Actual return on plan assets		5,237			2,322			—			—			—			—
	Employer contributions		1,200			2,100			239			239			201			243
	Participant contributions		—			—			—			—			88			93
	Benefits paid		(1,140	)		(1,125	)		(239	)		(239	)		(289	)		(336	)
	Expenses		(133	)		(127	)		—			—			—			—
	Fair value of plan assets at end of period	$	30,627			25,463			—			—			—			—
	Funded status of plans	$	(6,383	)		(17,253	)		(4,690	)		(9,299	)		(10,756	)		(12,542	)
	Amounts recognized in the balance sheet
	Current liability	$	—			—			(233	)		(236	)		(365	)		(410	)
	Noncurrent liability	$	(6,383	)		(17,253	)		(4,457	)		(9,063	)		(10,391	)		(12,132	)
	Deferred income taxes – net	$	2,504			6,587			1,840			3,313			4,219			4,702
	Accumulated other comprehensive (income)/loss	$	2,410			9,553			482			3,380			(213	)		1,170
	Amounts recognized in accumulated other comprehensive loss
	Net unrecognized (gain)/loss	$	3,942			15,677			799			5,579			(124	)		2,350
	Unrecognized prior service cost/(credit)		21			40			(7	)		(18	)		(245	)		(444	)
	Tax effects		(1,553	)		(6,164	)		(310	)		(2,181	)		156			(736	)
		$	2,410			9,553			482			3,380			(213	)		1,170
		Funded						Unfunded						Other
		Qualified						Nonqualified						Postretirement
		Retirement						Retirement						Plans
		Plan						Plan
	(Thousands of dollars)	2013			2012			2013			2012			2013			2012
	Assumptions used in measurement of benefit obligations
	Weighted average discount rate		4.84	%		3.94	%		4.84	%		3.94	%		4.85	%		3.9	%
	Rate of compensation increase		4	%		4	%		4	%		4	%		N/A			N/A
	Accumulated benefit obligations at year end	$	32,272			35,885			4,660			6,160			N/A			N/A
Retirement Expense and Other Postretirement Benefits Expense	'
	Components of net periodic retirement expense and other postretirement benefits expense consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Funded qualified retirement plan
	Service cost	$	1,549			1,630			1,026
	Interest cost		1,557			1,622			1,471
	Expected return on plan assets		(1,894	)		(1,692	)		(1,657	)
	Amortization of prior service cost		18			18			18
	Amortization of actuarial loss		852			982			137
	Net periodic benefit cost	$	2,082			2,560			995
	Unfunded nonqualified retirement plan
	Service cost	$	143			364			67
	Interest cost		193			355			177
	Amortization of prior service credit		(11	)		(11	)		(11	)
	Amortization of actuarial loss		74			383			18
	Net periodic benefit cost	$	399			1,091			251
	Other postretirement benefits
	Service cost	$	450			455			350
	Interest cost		431			467			451
	Amortization of prior service credit		(199	)		(199	)		(199	)
	Amortization of actuarial loss		8			73			—
	Net periodic benefit cost	$	690			796			602
Assumptions Used to Determine Net Periodic Benefit Cost - Pension Plans	'
	(Thousands of dollars)	2013			2012			2011
	Assumptions used to determine net periodic benefit cost – pension plans
	Weighted average discount rate		3.94	%		4.34	%		5.45	%
	Expected long-term rate of return on plan assets		7.5	%		7.5	%		7.5	%
	Rate of compensation increase		4	%		4	%		4	%
	Assumptions used to determine net periodic benefit cost – other postretirement plan
	Weighted average discount rate		3.9	%		4.3	%		5.35	%
	Other changes in plan assets and benefit obligations recognized in other comprehensive (income)/loss
	Net unrecognized loss/(gain)	$	(18,054	)		8,442			11,485
	Amortization of prior service credit		(7	)		(7	)		(7	)
	Amortization of actuarial losses		(934	)		(1,438	)		(155	)
	Amortization of plan amendment		199			199			199
	Tax effect of changes		7,372			(2,822	)		(4,519	)
	Total recognized in other comprehensive (income)/loss	$	(11,424	)		4,374			7,003
Estimated Benefit Payments by Year	'
	(Thousands of dollars)	Funded			Unfunded			Other
		Qualified			Non-			Post-
		Retirement			qualified			retirement
		Plan			Retirement			Plan
					Plan
	Estimated benefit payments by year
	2014	$	1,277			233			365
	2015		1,339			265			366
	2016		1,398			260			379
	2017		1,494			255			422
	2018		1,609			250			466
	2019 – 2023		10,604			1,562			3,042
Fair Value Investments Plan	'
	The following table sets forth by level within the fair value hierarchy, the Plan’s investments at fair value as of December 31, 2013.
		Fair Value Measurements at Reporting Date Using
	(Thousands of dollars)	Percent			Total			Level 1			Level 2			Level 3
		of			Carrying
		Total			Value
					at
					Dec. 31,
					2013
	Plan Investments
	Cash and cash equivalents		3.2		$	984			984			—			—
	Other		0.2			54			54			—			—
	Equity securities by sector:
	Energy		0.4			111			111			—			—
	Materials and industrials		2.6			784			784			—			—
	Consumer		4.7			1,435			1,435			—			—
	Health care		2.5			771			771			—			—
	Financials		0.8			259			259			—			—
	Information tech		4.6			1.409			1,409			—			—
	Foreign stocks		1			302			302			—			—
	U.S. Govt. and agency securities		12.3			3,775			1,633			2,142			—
	Corporate debt obligations		10.7			3,287			—			3,287			—
	Mutual funds:
	Dividends and growth		29.5			9,042			9,042			—			—
	International and emerging markets		5.9			1,798			1,798			—			—
	Exchange-traded funds		14.8			4,539			4,539			—			—
	Alternative investment funds		6.8			2,077			—			—			2,077
	Total plan investments at fair value		100		$	30,627			23,121			5,429			2,077
	Percent of fair value hierarchy					100			75.5			17.7			6.8
	The following table sets forth by level within the fair value hierarchy, the Plan’s investments at fair value as of December 31, 2012.
		Fair Value Measurements at Reporting Date Using
	(Thousands of dollars)	Percent			Total			Level 1			Level 2			Level 3
		of			Carrying
		Total			Value
					at
					Dec. 31,
					2012
	Plan Investments
	Cash and cash equivalents		6.3		$	1,602			1,602			—			—
	Other		0.2			55			55			—			—
	Equity securities by sector:
	Energy		1.2			293			293			—			—
	Materials and industrials		4.1			1,054			1,054			—			—
	Consumer		7.7			1,964			1,964			—			—
	Health care		3.5			886			886			—			—
	Financials		0.7			183			183			—			—
	Information tech		9.2			2,339			2,339			—			—
	Foreign stocks		1.6			415			415			—			—
	U.S. Govt. and agency securities		18			4,568			2,369			2,199			—
	Corporate debt obligations		13.1			3,332			—			3,332			—
	Mutual funds:
	Dividends and growth		26			6,610			6,610			—			—
	International and emerging markets		3.7			954			954			—			—
	Exchange-traded funds		4.7			1,208			1,208			—			—
	Total plan investments at fair value		100		$	25,463			19,932			5,531			—
	Percent of fair value hierarchy					100			78.3			21.7			—
Activity in Level 3 Investments	'
	The following table sets forth the activity in the Level 3 investments for the year ended December 31, 2013.
		Fair Value Measurements
		Using Significant
		Unobservable Inputs
		(Level 3)
	(Thousands of dollars)	Alternative Investments
		Funds
	Beginning balance at December 31, 2012	$	—
	Actual return on plan assets:
	Relating to assets still held at the reporting date		77
	Purchases, sales, and settlements		2,000
	Ending balance at December 31, 2013	$	2,077

Incentive_Plans_Tables

Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Valuation of Stock Options and Restricted Stock Performance Units	'
	Assumptions for the 2013, 2012, and 2011 valuation of stock options and restricted stock performance units consisted of the following:
		2013			2012			2011
	Expected term of options (in years)		6.27			6.27			6.27
	Weighted expected volatility		37.78	%		38.78	%		36.7	%
	Dividend yield		0.58	%		0.61	%		0.62	%
	Risk-free interest rate - performance restricted shares		0.6	%		0.6	%		2.09	%
	Risk-free interest rate - stock options		1.98	%		2	%		3.79	%
	Stock price as of valuation date	$	71.35			67.67			63.54
	Restricted performance share valuation	$	87.74			90.61			85.56
	Grant date fair value - stock options	$	26.2			24.92			20.89
Summary of Stock Options	'
	A summary of stock options as of December 31, 2013, and changes during the year ended are presented below:
		Shares			Weighted			Weighted			Aggregate
					Average			Average			Intrinsic
					Exercise			Remaining			Value
					Price			Contractual			$0
								Term (Years)
	Outstanding at January 1, 2013		125,920		$	54.92
	Granted		24,058			71.35
	Exercised		(17,979	)		42.26
	Forfeited/expired		(543	)		60.1
	Outstanding at December 31, 2013		131,456		$	59.64			6.4		$	1,174
	Exercisable at December 31, 2013		67,626		$	53.9			4.8		$	949
Summary of Stock Options Outstanding	'
	Additional information about stock options outstanding at December 31, 2013, consisted of the following:
		Options Outstanding									Options Exercisable
	Range of Exercise Prices	Number			Average			Average			Number		Average
		of			Life in			Exercise			of		Exercise
		Options			Years			Price			Options		Price
	$31.00—$35.00		4,751			4.7		$	34.25			4,751	$	34.25
	$41.00—$45.00		17,274			6		$	44.83			10,309	$	44.82
	$51.00—$55.00		32,863			2.8		$	53			32,863	$	53
	$56.00—$65.00		26,371			7.1		$	63.54			13,194	$	63.54
	$66.00—$75.00		50,197			8.6		$	69.43			6,509	$	67.67
			131,456									67,626
Summary of Nonvested Restricted Stock	'
	A summary of nonvested restricted stock as of December 31, 2013, and changes during the year then-ended are presented below:
		Shares			Weighted
					Average
					Grant-Date
					Fair Value
	Nonvested at January 1, 2013		76,352		$	52.09
	Granted		23,735			71.35
	Vested		(20,229	)		34.41
	Forfeited		(267	)		58.22
	Nonvested at December 31, 2013		79,591		$	62.31
Summary of Nonvested Restricted Stock Performance Units	'
	A summary of nonvested restricted stock performance units as of December 31, 2013, and changes during the year then-ended are presented below:
		Shares			Weighted
					Average
					Grant-Date
					Fair Value
	Nonvested at January 1, 2013		50,393		$	68.3
	Granted		16,427			87.74
	Vested		(13,892	)		43.48
	Forfeited		(303	)		77.57
	Nonvested at December 31, 2013		52,625		$	80.87

Supplemental_Cash_Flows_Disclo1

Supplemental Cash Flows Disclosures (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Interest and Income Taxes	'
	Additional information concerning cash flows at December 31 consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Income taxes paid in cash	$	11,042			4,227			762
	Interest paid		3,547			3,571			3,607
	Interest capitalized		(53	)		(36	)		(82	)
Non-cash Investing and Financing Activities	'
	Non-cash investing and financing activities excluded from the statement of cash flows include:
	(Thousands of dollars)	2013			2012			2011
	Issuance of restricted stock	$	935			1,393			1,456
	Land exchanges		—			—			87
(Increases)/Decreases in Operating Working Capital, Other Than Cash and Cash Equivalents	'
	(Increases)/decreases in operating working capital other than cash and cash equivalents, for each of the three years ended December 31 consisted of the following:
	(Thousands of dollars)	2013			2012			2011
	Trade accounts receivable	$	2,178			(457	)		(216	)
	Other receivables		(6	)		(12	)		97
	Inventories		(2,740	)		(541	)		1,708
	Prepaid expenses and other current assets		(184	)		963			(235	)
	Trade accounts payable		3,701			35			(585	)
	Accrued taxes other than income taxes		216			(19	)		(15	)
	Deferred revenues and other accrued liabilities		2,718			2,486			(1,674	)
		$	5,883			2,455			(920	)

Earnings_per_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Computation of Earnings Per Share	'
	The amounts used in computing earnings per share and the effect on income and weighted average number of shares outstanding of dilutive potential common stock consisted of the following:
	(Thousands of dollars, except per share amounts)	2013		2012		2011
	Net earnings allocated to common stock	$	25,924		9,144		2,644
	Net earnings allocated to participating securities		268		91		15
	Net income allocated to common stock and participating securities	$	26,192		9,235		2,659
	Weighted average number of common shares used in basic EPS		12,566		12,525		12,450
	Effect of dilutive stock awards		58		63		102
	Weighted average number of common shares and dilutive potential common stock used in EPS assuming dilution		12,624		12,588		12,552
	Earnings per common share
	Basic	$	2.06		0.73		0.21
	Assuming dilution	$	2.05		0.73		0.21
Information about Potentially Dilutive Securities Outstanding	'
	The following table provides information about potentially dilutive securities that were outstanding but were not included in the computation of diluted earnings per share because they were anti-dilutive or, in the case of the restricted performance shares, did not meet the metrics established for awarding:
		2013		2012		2011
	Options		50,197		26,459		26,993
	Restricted performance shares		52,625		29,831		14,013

Business_Segments_Tables

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Summary of Company's Business Segments	'
	Information about the Company’s business segments consisted of the following:
	(Thousands of dollars)		2013			2012			2011
	Net sales
	Woodlands		$	33,834			37,285			40,240
	Manufacturing2			167,955			105,956			83,889
	Real Estate			11,734			10,992			12,358
	Eliminations1			(13,821	)		(13,325	)		(14,640	)
			$	199,702			140,908			121,847
	Income before income taxes
	Operating income/(loss)
	Woodlands		$	16,749			18,374			20,416
	Manufacturing2			38,496			18,083			1,011
	Real Estate			(1,430	)		(2,099	)		(75	)
	Corporate			(17,994	)		(17,394	)		(14,293	)
	Eliminations			(158	)		168			400
	Operating income			35,663			17,132			7,459
	Equity in earnings of Del-Tin Fiber2			1,084			959			318
	Interest income			13			17			38
	Interest and other debt expense, net of capitalized interest			(4,578	)		(4,092	)		(4,029	)
	Gain on bargain purchase			3,413			—			—
	Other income			3,229			20			3
			$	38,824			14,036			3,789
	Total assets at year-end
	Woodlands		$	247,156			240,026			227,102
	Manufacturing2			85,837			30,136			33,801
	Real Estate			59,549			58,783			59,304
	Corporate3,4			18,802			24,264			21,663
			$	411,344			353,209			341,870
	Depreciation, amortization, and cost of fee timber harvested
	Woodlands		$	4,785			4,786			5,291
	Manufacturing2			9,910			5,378			5,999
	Real Estate			343			374			427
	Corporate			93			104			89
			$	15,131			10,642			11,806
	Capital expenditures
	Woodlands		$	12,755			18,553			7,817
	Manufacturing2			16,532			2,478			3,570
	Real Estate			4,267			2,996			4,223
	Corporate			14			7			87
			$	33,568			24,034			15,697
		1	Primarily intersegment sales of timber from Woodlands to Manufacturing.
		2	Del-Tin Fiber became a consolidated subsidiary, reported in the Manufacturing segment, upon acquisition of a controlling interest of its ownership effective April 1, 2013.
		3	Includes investment in Del-Tin Fiber, an equity method investee, of $6,293,000 and $7,113,000 at December 31, 2012, and 2011, respectively. (For additional information, see Note 4 – Business Combination.)
		4	Includes balance of timberland sale proceeds held by trustee, and there were none as of December 31, 2013, $7,000 as of December 31, 2012, and $567,000 in 2011.

Financial_Results_by_Quarter_U1

Financial Results by Quarter (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Results	'
			2013
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	41,563		53,247		56,520		48,372			199,702
	Gross profit			15,384		14,648		14,810		8,977			53,819
	Operating income			10,548		10,991		9,599		4,525			35,663
	Net income1			6,774		11,268		5,813		2,337			26,192
	Earnings per common share
	Basic		$	0.53		0.89		0.46		0.18			2.06
	Assuming dilution			0.53		0.88		0.46		0.18			2.05
	Dividends paid per common share2		$	0.1		0.1		0.1		0.1			0.4
			2012
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	30,639		37,105		36,499		36,665			140,908
	Gross profit			5,730		10,205		10,237		9,388			35,560
	Operating income			1,134		6,259		5,104		4,635			17,132
	Net income			97		3,516		3,218		2,404			9,235
	Earnings per common share
	Basic		$	0.01		0.28		0.25		0.19			0.73
	Assuming dilution			0.01		0.28		0.25		0.19			0.73
	Dividends paid per common share2		$	0.075		0.075		0.075		0.075			0.3
	(Thousands of dollars, except per share amounts)
			2011
			First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter			Year
	Net sales		$	29,395		32,268		31,371		28,813			121,847
	Gross profit			4,896		6,856		5,847		5,117			22,716
	Operating income			550		3,587		2,116		1,206			7,459
	Net income/(loss)			92		2,055		720		(208	)		2,659
	Earnings per common share
	Basic		$	0.01		0.16		0.06		(.02	)		0.21
	Assuming dilution			0.01		0.16		0.06		(.02	)		0.21
	Dividends paid per common share2		$	0.075		0.075		0.075		0.075			0.3
	1	Del-Tin Fiber, formerly an equity investment, became a consolidated subsidiary effective April 1, 2013. Net income for the second quarter of 2013 includes a gain on bargain purchase of $3,285,000 and a gain on previously held equity investment of $3,165,000. The fourth quarter includes additional bargain gain recognized of $128,000, for a total of $3,413,000 for the year. (For additional information, see Note 4 – Business Combinations.)
	2	Payment of dividends is the means by which Deltic Timber Corporation makes distributions to its shareholders of profits and cash flows generated by the Company’s business operations. These dividends are declared by the Company’s Board of Directors on a quarterly basis. The Company’s dividend strategy is to grow the amount of the dividend over time, at a rate of increase that is believed to be sustainable. The timing and amount of future increases are based on the estimated trend for future earnings and cash flow, taking into account other potential uses of the Company’s capital resources including, but not limited to, acquisition opportunities, capital expenditures for existing operations, debt repayments, and repurchases of the Company’s common stock.

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	acre
Significant Accounting Policies [Line Items]	'	'	'
Area of land own by company	458,600	'	'
Cash equivalents maturity period	'Three months or less	'	'
Special charges bad debt expense	$158,000	$133,000	$63,000
Balance in allowance account	172,000	127,000	'
Percentage of interest holds by company	50.00%	'	'
Maximum completion period of acquisition of LKE properties	'180 days	'	'
Proceeds from sales of land deposited with LKE intermediary	0	7,000	'
Land lease term period	'1 year	'	'
Deferred hunting lease revenue	1,684,000	1,562,000	'
Deferred mineral lease revenue	2,085,000	3,721,000	'
Accrued property tax expenses	1,798,000	1,783,000	'
Advertising Costs	716,000	732,000	768,000
Other noncurrent liabilities [Member]	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Deferred mineral lease revenue	649,000	2,064,000	'
Other current liabilities [Member]	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Deferred mineral lease revenue	$1,436,000	$1,657,000	'
Roads constructed and other land improvements [Member]	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Estimated useful life	'10 years	'	'

Inventories_Inventories_Detail

Inventories - Inventories (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventories	'	'
Supplies	$2,424	$322
Inventory	12,439	4,894
Logs [Member]	'	'
Inventories	'	'
Raw material	1,612	1,341
Del-Tin - wood fiber [Member]	'	'
Inventories	'	'
Raw material	440	'
Lumber [Member]	'	'
Inventories	'	'
Finished goods	4,145	3,231
Medium density fiberboard [Member]	'	'
Inventories	'	'
Finished goods	3,110	'
Finished goods	$708	'

Prepaid_Expenses_and_Other_Cur2

Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Prepaid Expense and Other Assets Current [Abstract]	'	'
Short-term deferred tax assets	$1,901	$2,074
Refundable income taxes	109	123
Prepaid expenses	692	88
Other current assets	453	523
Prepaid expenses and other current assets	$3,155	$2,808

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
Business Acquisition [Line Items]	'	'	'
Gain on previously held equity interest	'	$3,165,000	$3,165,000
Gain on bargain purchase	128,000	3,285,000	3,413,000
Del Tin Fiber [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Percentage membership interest of Del-Tin Fiber LLC	50.00%	'	50.00%
Total consideration	'	'	20,000,000
Cash payment	'	'	5,170,000
Annual production capacity	150,000,000	'	150,000,000
Percentage of company owning	'	'	100.00%
Long-term liabilities	29,000,000	'	29,000,000
Outstanding industrial bonds due	'	'	'2027
Gain on previously held equity interest	'	'	3,165,000
Fair value of previously held investment in Del-Tin Fiber	'	'	10,786,000
Business combination on over carrying value	7,621,000	'	7,621,000
Business acquisition on company owned equity method investment	50.00%	'	50.00%
Weight average cost of capital	15.00%	'	15.00%
Gain on bargain purchase	'	'	3,413,000
Net sales	'	'	47,812,000
Net income	'	'	$3,068,000

Business_Combinations_Purchase

Business Combinations - Purchase Price Allocated to Net Tangible and Intangible Assets (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
Business Acquisition [Line Items]	'	'	'
Gain on bargain purchase	$128,000	$3,285,000	$3,413,000
Del Tin Fiber [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Accounts receivable	4,229,000	'	4,229,000
Inventories	4,805,000	'	4,805,000
Other current assets	360,000	'	360,000
Property, plant, and equipment	40,960,000	'	40,960,000
Intangible assets	1,700,000	'	1,700,000
Other assets	171,000	'	171,000
Current liabilities	-1,653,000	'	-1,653,000
Deferred tax liabilities	-2,203,000	'	-2,203,000
Long-term liabilities	-29,000,000	'	-29,000,000
Net assets acquired	19,369,000	'	19,369,000
Cash paid	'	'	-5,170,000
Fair value of previously held investment in Del-Tin Fiber	'	'	-10,786,000
Gain on bargain purchase	'	'	$3,413,000
Del Tin Fiber [Member] | Internally developed software [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquired intangible assets useful life	'	'	'3 years

Business_Combinations_Summariz

Business Combinations - Summarizes Combined Results of Operations on Pro Forma Basis (Detail) (Del Tin Fiber [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Del Tin Fiber [Member]	'	'
Business Acquisition [Line Items]	'	'
Net sales	$217,268	$207,446
Net income	$21,193	$8,846
Basic earnings per common share	$1.69	$0.71
Diluted earnings per common share	$1.68	$0.70

Timber_and_Timberlands_Summary

Timber and Timberlands - Summary of Timber and Timberlands (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Purchased stumpage inventory	$2,388	$902
Timberlands	102,609	99,159
Fee timber	253,768	246,105
Logging facilities	2,628	2,601
Gross	361,393	348,767
Less accumulated cost of fee timber harvested and facilities depreciation	-113,056	-108,873
Timber and timberlands - net	248,833	240,215
Strategic timber and timberlands [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Timber and timberlands - net	248,337	239,894
Non-strategic timber and timberlands [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Timber and timberlands - net	$496	$321

Timber_and_Timberlands_Additio

Timber and Timberlands - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008
	acre	acre		acre
Timber And Timberlands Textual [Abstract]	'	'	'	'
Acres of non- strategic timberlands	'	'	'	10,000
Acres of timber land available for sale	1,000	700	'	'
Gains from sales of non-strategic timberland	$1,715,000	$1,910,000	$2,797,000	'
Gains recognized from non-monetary land exchanges	0	0	47,000	'
Cost of fee timber harvested	4,494,000	4,497,000	4,963,000	'
Logging facilities depreciation	$92,000	$94,000	$93,000	'

Property_Plant_and_Equipment_P

Property, Plant, and Equipment - Property, Plant, and Equipment (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Land [Member]

Land [Member]

Land improvements [Member]

Land improvements [Member]

Land improvements [Member]

Land improvements [Member]

Buildings and structures [Member]

Buildings and structures [Member]

Buildings and structures [Member]

Buildings and structures [Member]

Machinery and equipment [Member]

Machinery and equipment [Member]

Machinery and equipment [Member]

Machinery and equipment [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant, and equipment, useful life

'

'

'

'

'

'

'10 years

'20 years

'

'

'10 years

'20 years

'

'

'3 years

'15 years

Property, plant, and equipment, gross

$178,122

$120,531

$947

$357

$8,835

$6,322

'

'

$22,599

$13,985

'

'

$145,741

$99,867

'

'

Less accumulated depreciation

-102,863

-93,863

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant, and equipment, net

$75,259

$26,668

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property_Plant_and_Equipment_A

Property, Plant, and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Plant And Equipment [Abstract]	'	'	'
Depreciation of property, plant, and equipment charged to operations	$10,544,000	$6,051,000	$6,749,000
Gains/(losses) on disposals or retirements of assets included in operating income	$362,000	($128,000)	$36,000

Deferred_Revenues_and_Other_Ac2

Deferred Revenues and Other Accrued Liabilities - Deferred Revenues and Other Accrued Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Revenue Disclosure [Abstract]	'	'
Deferred revenues - current	$3,697	$3,794
Vacation accrual	1,290	971
Deferred compensation	3,442	2,720
All other current liabilities	1,901	1,609
Deferred revenues and other accrued liabilities	$10,330	$9,094

Other_Noncurrent_Liabilities_O

Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Liabilities Disclosure [Abstract]	'	'
Accumulated postretirement benefit obligation	$10,391	$12,132
Excess retirement plan	4,457	9,063
Accrued pension liability	6,383	17,254
Deferred revenue - long-term portion	649	2,064
Uncertain tax positions liability	1,185	1,325
All other noncurrent payables	2,678	2,644
Other noncurrent liabilities, net	$25,743	$44,482

Credit_Facilities_Additional_I

Credit Facilities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Sun Trust Bank [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Amount available on credit facility	$340,000,000	'
Option to increase in the amount of aggregate revolving commitments	50,000,000	'
Credit facility occurred date	2-May-13	'
Credit facility expiry date	1-May-18	'
Amendment fees incurred	765,000	'
Remaining unamortized prior costs	617,000	'
Outstanding borrowings	21,000,000	23,000,000
Amount available in excess of all borrowings outstanding	319,000,000	274,500,000
Interest on borrowings	'Base rate or an adjusted Eurodollar rate plus an applicable margin	'
Maximum leverage ratio	0.65%	'
Sun Trust Bank [Member] | Minimum [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Timber market value	175.00%	'
Commitment fee payable per annum	0.20%	'
Sun Trust Bank [Member] | Maximum [Member] | Revolving Credit Facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Commitment fee payable per annum	0.35%	'
Bancorp South [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Outstanding borrowings	554,000	719,000
Bancorp South [Member] | short-term credit facility [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Credit facility expiry date	31-Dec-14	'
Outstanding borrowings	0	0
Amount available in excess of all borrowings outstanding	1,000,000	1,000,000
Interest on borrowings	'Based upon the New York Prime rate	'
Amount available on short term credit facility	$1,000,000	'

Indebtedness_Companys_Indebted

Indebtedness - Company's Indebtedness (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Long-term debt	$90,000	$63,000
Notes Payable, 1.54%*, due 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, including current maturities	21,000	23,000
Senior notes payable, 6.10%, due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, including current maturities	40,000	40,000
Union County, Arkansas Taxable Industrial Revenue Bonds, .31%*, due 2027 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, including current maturities	$29,000	'

Indebtedness_Companys_Indebted1

Indebtedness - Company's Indebtedness (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2013
Notes Payable, 1.54%*, due 2018 [Member]	'
Debt Instrument [Line Items]	'
Weighted average interest rate of notes payable	1.54%
Debt instrument maturity year	31-Dec-18
Senior notes payable, 6.10%, due 2016 [Member]	'
Debt Instrument [Line Items]	'
Weighted average interest rate of notes payable	6.10%
Debt instrument maturity year	31-Dec-16
Union County, Arkansas Taxable Industrial Revenue Bonds, .31%*, due 2027 [Member]	'
Debt Instrument [Line Items]	'
Weighted average interest rate of notes payable	0.31%
Debt instrument maturity year	31-Dec-27

Indebtedness_Additional_Inform

Indebtedness - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Sep. 01, 2004	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]	'	'	'	'
Percentage of Timber market value	'	200.00%	'	'
Scheduled maturities of long-term debt, year one	'	$0	'	'
Scheduled maturities of long-term debt, year two	'	0	'	'
Scheduled maturities of long-term debt, year three	'	40,000,000	'	'
Scheduled maturities of long-term debt, year four	'	0	'	'
Scheduled maturities of long-term debt, year five	'	21,000,000	'	'
Union County, Arkansas Taxable Industrial Revenue Bonds, .31%*, due 2027 [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Private placement long term debt outstanding	'	29,000,000	'	'
Weighted average interest rate of notes payable	'	0.31%	'	'
Long-term liabilities	'	29,000,000	'	'
Bonds issued to complete construction of plant	'	60,000,000	'	'
Unpaid interest and principal due date	'	1-Oct-27	'	'
Retirement of bonds	31,000,000	'	'	'
Average interest rate on bonds	'	0.38%	0.70%	0.87%
Senior notes payable, 6.10%, due 2016 [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Private placement long term debt outstanding	'	40,000,000	40,000,000	'
Weighted average interest rate of notes payable	'	6.10%	'	'
Financial covenants, including minimum consolidated net worth	'	175,567,000	'	'
Financial covenants, including net income accrued	'	50.00%	'	'
Installment payments	'	$0	'	'
Net proceeds from public or private offering of common or preferred stock	'	100.00%	'	'
Maximum funded debt	'	0.6	'	'
Fixed charge coverage ratio	'	2.5	'	'
Senior notes payable, 6.10%, due 2016 [Member] | Minimum [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Percentage of Timber market value	'	200.00%	'	'

Indebtedness_Ratio_Requirement

Indebtedness - Ratio Requirements for Credit Facility and Senior Notes Payable (Detail)	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Debt Covenants [Line Items]	'	'
Total outstanding debt as a percentage of total debt allowed based on the minimum timber market value covenant	48.24%	44.15%
Revolving credit facility requirement for the leverage ratio	0.65	'
Percentage of Timber market value	200.00%	'
Revolving credit facility	175.00%	'
Covenants Requirements [Member]	'	'
Schedule Of Debt Covenants [Line Items]	'	'
Leverage ratio should be less than:	0.6	'
Fixed charge coverage ratio should be greater than:	2.5	'
Actual Ratio [Member]	'	'
Schedule Of Debt Covenants [Line Items]	'	'
Leverage ratio should be less than:	0.254	0.253
Fixed charge coverage ratio should be greater than:	10.04	5.39

Income_Taxes_Schedule_of_Compo

Income Taxes - Schedule of Components of Income Tax Expense/(Benefit) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal	'	'	'
Current	$10,237	$4,743	$930
Deferred	138	-685	1
Total federal income tax expense (benefit)	10,375	4,058	931
State	'	'	'
Current	2,154	707	-909
Deferred	103	36	1,108
Total state and local income tax expense (benefit)	2,257	743	199
Income tax provision as reported	$12,632	$4,801	$1,130

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Company's income tax expense at the statutory U.S. federal rate	35.00%	35.00%	35.00%
Unrecognized tax benefits	$776,000	'	'
Interest expense	121,000	'	'
Deferred revenues other accrued liabilities for interest and penalties	$621,000	$451,000	'

Income_Taxes_Schedule_of_Recon

Income Taxes - Schedule of Reconciliation of Income Tax Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
U.S. Federal income tax using statutory tax rate	$13,588	$4,913	$1,326
State tax, net of federal tax benefit	1,458	446	160
Permanent differences	-1,219	-558	-306
Tax effects resulting from:	'	'	'
Gain on bargain purchase	-1,195	'	'
Other	'	'	-50
Income tax provision as reported	$12,632	$4,801	$1,130

Income_Taxes_Schedule_of_Defer

Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets	'	'
Investment in real estate held for development and sale	$16,914	$16,560
Postretirement and other employee benefits	13,435	19,652
Other deferred tax assets	2,360	2,942
Total deferred tax assets	32,709	39,154
Deferred tax liabilities	'	'
Investment in Del-Tin Fiber	'	-5,246
Timber and timberlands	-26,158	-25,520
Property, plant, and equipment	-11,838	-3,797
Other deferred tax liabilities	-326	-151
Total deferred tax liabilities	-38,322	-34,714
Net deferred tax assets/(liabilities)	($5,613)	$4,440

Income_Taxes_Schedule_of_Defer1

Income Taxes - Schedule of Deferred Tax Assets and Liabilities Classified in Accompanying Consolidated Balance Sheets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Current tax assets	$1,901	$2,074
Long-term tax assets	'	2,837
Long-term tax liabilities	-7,514	-471
Net deferred tax assets/(liabilities)	($5,613)	$4,440

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Balance at January 1	$1,331	$1,774
Lapse of statute	-146	-443
Balance at December 31	$1,185	$1,331

Stockholders_Rights_Plan_Addit

Stockholders Rights Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Stockholders Rights Plan Textual [Abstract]	'
Stockholders right plan amended and increase the exercise price	$200
Person becoming beneficial owner	15.00%

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Fair Value Measurements for Financial Liabilities Accounted on a Recurring Basis (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Liabilities	'
Nonqualified employee savings plan	$1,353
Level 1 [Member]	'
Liabilities	'
Nonqualified employee savings plan	$1,353

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial liabilities	'	'
Long-term debt, including current liabilities, Carrying Amount	$90,000	$63,000
Long-term debt, including current liabilities, Estimated Fair Value	$94,534	$68,029

Concentration_of_Credit_Risks_

Concentration of Credit Risks - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Risks And Uncertainties [Abstract]	'	'
Accounts receivables	$0	$0

Other_Comprehensive_Income_Dis2

Other Comprehensive Income Disclosures - Changes in Accumulated Other Comprehensive Loss by Component (Net of Tax) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance, January 1	($14,103)	($9,729)	($2,726)
Amounts reclassified from AOCL	451	757	-23
Net gain (loss) arising during period	10,973	-5,131	-6,980
Net current period other comprehensive income (loss)	11,424	-4,374	-7,003
Ending Balance, December 31	-2,679	-14,103	-9,729
Defined Benefit Funded Retirement Plan [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance, January 1	-9,553	-8,124	-2,638
Amounts reclassified from AOCL	529	608	94
Net gain (loss) arising during period	6,614	-2,037	-5,580
Net current period other comprehensive income (loss)	7,143	-1,429	-5,486
Ending Balance, December 31	-2,410	-9,553	-8,124
Defined Benefit Unfunded Retirement Plan [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance, January 1	-3,380	-855	-304
Amounts reclassified from AOCL	38	226	4
Net gain (loss) arising during period	2,860	-2,751	-555
Net current period other comprehensive income (loss)	2,898	-2,525	-551
Ending Balance, December 31	-482	-3,380	-855
Post Retirement Benefit Plan [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Beginning Balance, January 1	-1,170	-750	216
Amounts reclassified from AOCL	-116	-77	-121
Net gain (loss) arising during period	1,499	-343	-845
Net current period other comprehensive income (loss)	1,383	-420	-966
Ending Balance, December 31	$213	($1,170)	($750)

Other_Comprehensive_Income_Dis3

Other Comprehensive Income Disclosures - Reclassification Out of Accumulated Other Comprehensive Loss (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Amortization of prior service costs	$7	$7	$7
Amortization of actuarial losses	934	1,438	155
Amortization of plan amendment	-199	-199	-199
Income tax benefit/(expense)	-7,372	2,822	4,519
Total reclassifications - net of tax	451	757	-23
Defined Benefit Funded Retirement Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Total reclassifications - net of tax	529	608	94
Defined Benefit Unfunded Retirement Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Total reclassifications - net of tax	38	226	4
Post Retirement Benefit Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Total reclassifications - net of tax	-116	-77	-121
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Amortization of prior service costs	7	7	7
Amortization of actuarial losses	934	1,438	155
Amortization of plan amendment	-199	-199	-199
Total before tax	742	1,246	-37
Income tax benefit/(expense)	-291	-489	14
Total reclassifications - net of tax	451	757	-23
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Funded Retirement Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Amortization of prior service costs	18	18	18
Amortization of actuarial losses	852	982	137
Total before tax	870	1,000	155
Income tax benefit/(expense)	-341	-392	-61
Total reclassifications - net of tax	529	608	94
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Unfunded Retirement Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Amortization of prior service costs	-11	-11	-11
Amortization of actuarial losses	74	383	18
Total before tax	63	372	7
Income tax benefit/(expense)	-25	-146	-3
Total reclassifications - net of tax	38	226	4
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post Retirement Benefit Plan [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Amortization of actuarial losses	8	73	'
Amortization of plan amendment	-199	-199	-199
Total before tax	-191	-126	-199
Income tax benefit/(expense)	75	49	78
Total reclassifications - net of tax	($116)	($77)	($121)

Other_Comprehensive_Income_Dis4

Other Comprehensive Income Disclosures - Tax Effects by Component (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Equity [Abstract]	'		'		'
Gains/(losses) arising during the period, Before Tax Amount	$18,054		($8,442)		($11,485)
Amortization of prior service costs, Before Tax Amount	7		7		7
Amortization of actuarial losses/(gains), Before Tax Amount	934		1,438		155
Amortization of plan amendment, Before tax amount	-199		-199		-199
Total before tax	18,796		-7,196		-11,522
Gains/(losses) arising during the period, Tax (Expenses) or benefits	-7,081		3,311		4,505
Amortization of prior service costs, Tax (Expenses) or benefits	-3		-3		-3
Amortization of actuarial losses/(gains), Tax (Expenses) or benefits	-366		-564		-61
Amortization of plan amendment, Tax (Expenses) or benefits	78		78		78
Total Tax (Expenses) or benefits	-7,372		2,822		4,519
Gains/(losses) arising during the period	10,973		-5,131		-6,980
Amortization of prior service costs	4	[1]	4	[1]	4	[1]
Amortization of actuarial losses/(gains)	568	[1]	874	[1]	94	[1]
Amortization of plan amendment, Net of Tax Amount	-121	[1]	-121	[1]	-121	[1]
Total reclassifications - net of tax	$11,424		($4,374)		($7,003)
[1]	The amortizations out of comprehensive income for 2012 and 2011 have been revised to conform to the 2013 presentation.

Employee_and_Retiree_Benefit_P2

Employee and Retiree Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Employee service hours	1,000	'	'
Employment commencement period	'Both the 1,000 hours requirement and the employment requirement for each twelve-month period.	'	'
Service period of employee	'12 months	'	'
Amendment of other defined benefit postretirement plans	$199,000	'	'
Percentage of expected long-term rate of return on pension plan	7.50%	'	'
Health care inflation cost assumed to increase at an annual rate	5.00%	'	'
A one percentage-point increase in the assumed health care cost trend rate increases the aggregate service and interest cost components	169,000	'	'
A one percentage-point increase in the assumed health care cost trend rate and the benefit obligation	1,704,000	'	'
One percentage-point decrease in the assumed rate	133,000	'	'
One percentage-point decrease in the assumed rate and the benefit obligation	1,362,000	'	'
Planed Asset Allocation Levels, Minimum	45.00%	'	'
Planed Asset Allocation Levels, Maximum	70.00%	'	'
Plan assets held in the securities	2.50%	'	'
Plan assets were invested in mortgage-backed securities	2.00%	'	'
Fixed Income Securities [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	25.00%	'	'
Planed Asset Allocation Levels, Maximum	55.00%	'	'
Alternative Investment Funds [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	0.00%	'	'
Planed Asset Allocation Levels, Maximum	15.00%	'	'
Cash and Cash Equivalents [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	'	'	'
Planed Asset Allocation Levels, Maximum	5.00%	'	'
Large Cap Market [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	40.00%	'	'
Planed Asset Allocation Levels, Maximum	60.00%	'	'
Mid and Small Cap Equity [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	5.00%	'	'
Planed Asset Allocation Levels, Maximum	15.00%	'	'
International Equity [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Planed Asset Allocation Levels, Minimum	0.00%	'	'
Planed Asset Allocation Levels, Maximum	25.00%	'	'
Planed Asset Allocation Levels	40.00%	'	'
Pension Plan, Defined Benefit [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Net loss and net prior service cost for retirement pension plan	54,000	'	'
Percentage of expected long-term rate of return on pension plan	7.50%	7.50%	7.50%
Supplemental Employee Retirement Plan, Defined Benefit [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Net loss and net estimated prior service cost for retirement pension plan	10,000	'	'
Funded Qualified Retirement Plan [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Projected expense	1,207,000	'	'
Contributions towards the qualified retirement plan	1,500,000	'	'
Employer contributions	1,200,000	2,100,000	'
Unfunded Nonqualified Retirement Plan [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Contributions towards the qualified retirement plan	233,000	'	'
Employer contributions	239,000	239,000	'
Other Postretirement Plans [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Contributions towards the qualified retirement plan	365,000	'	'
Employer contributions	201,000	243,000	'
Thrift Plan [Member]	'	'	'
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]	'	'	'
Employer contributions	$792,000	584,000	598,000

Employee_and_Retiree_Benefit_P3

Employee and Retiree Benefit Plans - Plans' Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in plan assets	'	'	'
Fair value of plan assets at end of period	$30,627,000	$25,463,000	'
Amounts recognized in the balance sheet	'	'	'
Noncurrent liability	-4,457,000	-9,063,000	'
Funded Qualified Retirement Plan [Member]	'	'	'
Change in benefit obligation	'	'	'
Benefit obligation at beginning of period	42,716,000	36,736,000	'
Service cost	1,549,000	1,630,000	1,026,000
Interest cost	1,557,000	1,622,000	1,471,000
Actuarial (gain)/loss	-7,672,000	3,853,000	'
Benefits paid	-1,140,000	-1,125,000	'
Benefit obligation at end of period	37,010,000	42,716,000	36,736,000
Change in plan assets	'	'	'
Fair value of plan assets at beginning of period	25,463,000	22,293,000	'
Actual return on plan assets	5,237,000	2,322,000	'
Employer contributions	1,200,000	2,100,000	'
Benefits paid	-1,140,000	-1,125,000	'
Expenses	-133,000	-127,000	'
Fair value of plan assets at end of period	30,627,000	25,463,000	22,293,000
Funded status of plans	-6,383,000	-17,253,000	'
Amounts recognized in the balance sheet	'	'	'
Noncurrent liability	-6,383,000	-17,253,000	'
Deferred income taxes - net	2,504,000	6,587,000	'
Accumulated other comprehensive (income)/loss	2,410,000	9,553,000	'
Amounts recognized in accumulated other comprehensive loss	'	'	'
Net unrecognized (gain)/loss	3,942,000	15,677,000	'
Unrecognized prior service cost/(credit)	21,000	40,000	'
Tax effects	-1,553,000	-6,164,000	'
Amounts recognized in accumulated other comprehensive loss, Total	2,410,000	9,553,000	'
Assumptions used in measurement of benefit obligations	'	'	'
Weighted average discount rate	4.84%	3.94%	'
Rate of compensation increase	4.00%	4.00%	'
Accumulated benefit obligations at year end	32,272,000	35,885,000	'
Unfunded Nonqualified Retirement Plan [Member]	'	'	'
Change in benefit obligation	'	'	'
Benefit obligation at beginning of period	9,299,000	4,294,000	'
Service cost	143,000	364,000	67,000
Interest cost	192,000	354,000	177,000
Actuarial (gain)/loss	-4,705,000	4,526,000	'
Benefits paid	-239,000	-239,000	'
Benefit obligation at end of period	4,690,000	9,299,000	4,294,000
Change in plan assets	'	'	'
Employer contributions	239,000	239,000	'
Benefits paid	-239,000	-239,000	'
Funded status of plans	-4,690,000	-9,299,000	'
Amounts recognized in the balance sheet	'	'	'
Current liability	-233,000	-236,000	'
Noncurrent liability	-4,457,000	-9,063,000	'
Deferred income taxes - net	1,840,000	3,313,000	'
Accumulated other comprehensive (income)/loss	482,000	3,380,000	'
Amounts recognized in accumulated other comprehensive loss	'	'	'
Net unrecognized (gain)/loss	799,000	5,579,000	'
Unrecognized prior service cost/(credit)	-7,000	-18,000	'
Tax effects	-310,000	-2,181,000	'
Amounts recognized in accumulated other comprehensive loss, Total	482,000	3,380,000	'
Assumptions used in measurement of benefit obligations	'	'	'
Weighted average discount rate	4.84%	3.94%	'
Rate of compensation increase	4.00%	4.00%	'
Accumulated benefit obligations at year end	4,660,000	6,160,000	'
Other Postretirement Plans [Member]	'	'	'
Change in benefit obligation	'	'	'
Benefit obligation at beginning of period	12,542,000	11,297,000	'
Service cost	450,000	455,000	350,000
Interest cost	431,000	467,000	451,000
Participant contributions	88,000	93,000	'
Actuarial (gain)/loss	-2,466,000	566,000	'
Benefits paid	-289,000	-336,000	'
Benefit obligation at end of period	10,756,000	12,542,000	11,297,000
Change in plan assets	'	'	'
Employer contributions	201,000	243,000	'
Participant contributions	88,000	93,000	'
Benefits paid	-289,000	-336,000	'
Funded status of plans	-10,756,000	-12,542,000	'
Amounts recognized in the balance sheet	'	'	'
Current liability	-365,000	-410,000	'
Noncurrent liability	-10,391,000	-12,132,000	'
Deferred income taxes - net	4,219,000	4,702,000	'
Accumulated other comprehensive (income)/loss	-213,000	1,170,000	'
Amounts recognized in accumulated other comprehensive loss	'	'	'
Net unrecognized (gain)/loss	-124,000	2,350,000	'
Unrecognized prior service cost/(credit)	-245,000	-444,000	'
Tax effects	156,000	-736,000	'
Amounts recognized in accumulated other comprehensive loss, Total	($213,000)	$1,170,000	'
Assumptions used in measurement of benefit obligations	'	'	'
Weighted average discount rate	4.85%	3.90%	'

Employee_and_Retiree_Benefit_P4

Employee and Retiree Benefit Plans - Retirement Expense and Other Postretirement Benefits Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Funded Qualified Retirement Plan [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	$1,549	$1,630	$1,026
Interest cost	1,557	1,622	1,471
Expected return on plan assets	-1,894	-1,692	-1,657
Amortization of prior service cost	18	18	18
Amortization of actuarial loss	852	982	137
Net periodic benefit cost	2,082	2,560	995
Unfunded Nonqualified Retirement Plan [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	143	364	67
Interest cost	192	354	177
Amortization of prior service cost	-11	-11	-11
Amortization of actuarial loss	74	383	18
Net periodic benefit cost	399	1,091	251
Other Postretirement Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	450	455	350
Interest cost	431	467	451
Amortization of prior service cost	-199	-199	-199
Amortization of actuarial loss	8	73	'
Net periodic benefit cost	$690	$796	$602

Employee_and_Retiree_Benefit_P5

Employee and Retiree Benefit Plans - Assumptions Used to Determine Net Periodic Benefit Cost - Pension Plans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assumptions used to determine net periodic benefit cost - pension plans	'	'	'
Expected long-term rate of return on plan assets	7.50%	'	'
Assumptions used to determine net periodic benefit cost - other postretirement plan	'	'	'
Expected long-term rate of return on plan assets	7.50%	'	'
Other changes in plan assets and benefit obligations recognized in other comprehensive (income)/loss	'	'	'
Net unrecognized loss/(gain)	($18,054)	$8,442	$11,485
Amortization of prior service credit	-7	-7	-7
Amortization of actuarial losses	-934	-1,438	-155
Amortization of plan amendment	199	199	199
Tax effect of changes	7,372	-2,822	-4,519
Total recognized in other comprehensive (income)/loss	($11,424)	$4,374	$7,003
Pension Plan, Defined Benefit [Member]	'	'	'
Assumptions used to determine net periodic benefit cost - pension plans	'	'	'
Weighted average discount rate	3.94%	4.34%	5.45%
Expected long-term rate of return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	4.00%	4.00%	4.00%
Assumptions used to determine net periodic benefit cost - other postretirement plan	'	'	'
Weighted average discount rate	3.94%	4.34%	5.45%
Expected long-term rate of return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	4.00%	4.00%	4.00%
Other Postretirement Plans [Member]	'	'	'
Assumptions used to determine net periodic benefit cost - pension plans	'	'	'
Weighted average discount rate	3.90%	4.30%	5.35%
Assumptions used to determine net periodic benefit cost - other postretirement plan	'	'	'
Weighted average discount rate	3.90%	4.30%	5.35%

Employee_and_Retiree_Benefit_P6

Employee and Retiree Benefit Plans - Estimated Benefit Payments by Year (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Funded Qualified Retirement Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	$1,277
2015	1,339
2016	1,398
2017	1,494
2018	1,609
2019 - 2023	10,604
Unfunded Nonqualified Retirement Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	233
2015	265
2016	260
2017	255
2018	250
2019 - 2023	1,562
Other Postretirement Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	365
2015	366
2016	379
2017	422
2018	466
2019 - 2023	$3,042

Employee_and_Retiree_Benefit_P7

Employee and Retiree Benefit Plans - Fair Value Investments Plan (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	100.00%	100.00%
Total plan investments at fair value	$30,627	$25,463
Cash and Cash Equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	3.20%	6.30%
Total plan investments at fair value	984	1,602
Other [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	0.20%	0.20%
Total plan investments at fair value	54	55
Us Govt And Agency Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	12.30%	18.00%
Total plan investments at fair value	3,775	4,568
Corporate Debt Obligations [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	10.70%	13.10%
Total plan investments at fair value	3,287	3,332
Dividends And Growth [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	29.50%	26.00%
Total plan investments at fair value	9,042	6,610
International And Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	5.90%	3.70%
Total plan investments at fair value	1,798	954
Exchange Traded Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	14.80%	4.70%
Total plan investments at fair value	4,539	1,208
Alternative Investment Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	6.80%	'
Total plan investments at fair value	2,077	'
Energy [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	0.40%	1.20%
Total plan investments at fair value	111	293
Materials And Industrials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	2.60%	4.10%
Total plan investments at fair value	784	1,054
Consumer [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	4.70%	7.70%
Total plan investments at fair value	1,435	1,964
Health Care [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	2.50%	3.50%
Total plan investments at fair value	771	886
Financials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	0.80%	0.70%
Total plan investments at fair value	259	183
Information Tech [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	4.60%	9.20%
Total plan investments at fair value	1,409	2,339
Foreign Stocks [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	1.00%	1.60%
Total plan investments at fair value	302	415
Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	75.50%	78.30%
Total plan investments at fair value	23,121	19,932
Level 1 [Member] | Cash and Cash Equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	984	1,602
Level 1 [Member] | Other [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	54	55
Level 1 [Member] | Us Govt And Agency Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	1,633	2,369
Level 1 [Member] | Corporate Debt Obligations [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 1 [Member] | Dividends And Growth [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	9,042	6,610
Level 1 [Member] | International And Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	1,798	954
Level 1 [Member] | Exchange Traded Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	4,539	1,208
Level 1 [Member] | Alternative Investment Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 1 [Member] | Energy [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	111	293
Level 1 [Member] | Materials And Industrials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	784	1,054
Level 1 [Member] | Consumer [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	1,435	1,964
Level 1 [Member] | Health Care [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	771	886
Level 1 [Member] | Financials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	259	183
Level 1 [Member] | Information Tech [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	1,409	2,339
Level 1 [Member] | Foreign Stocks [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	302	415
Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	17.70%	21.70%
Total plan investments at fair value	5,429	5,531
Level 2 [Member] | Cash and Cash Equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Other [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Us Govt And Agency Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	2,142	2,199
Level 2 [Member] | Corporate Debt Obligations [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	3,287	3,332
Level 2 [Member] | Dividends And Growth [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | International And Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Exchange Traded Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Alternative Investment Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Energy [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Materials And Industrials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Consumer [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Health Care [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Financials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Information Tech [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 2 [Member] | Foreign Stocks [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percent of fair value hierarchy	6.80%	'
Total plan investments at fair value	2,077	'
Level 3 [Member] | Cash and Cash Equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Other [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Us Govt And Agency Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Corporate Debt Obligations [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Dividends And Growth [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | International And Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Exchange Traded Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Alternative Investment Funds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	2,077	'
Level 3 [Member] | Energy [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Materials And Industrials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Consumer [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Health Care [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Financials [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Information Tech [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'
Level 3 [Member] | Foreign Stocks [Member] | Equity Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Total plan investments at fair value	'	'

Employee_and_Retiree_Benefit_P8

Employee and Retiree Benefit Plans - Activity in Level 3 Investments (Detail) (Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Level 3 [Member]	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'
Beginning balance	'
Actual return on plan assets:	'
Relating to assets still held at the reporting date	77
Purchases, sales, and settlements	2,000
Ending balance	$2,077

Incentive_Plans_Additional_Inf

Incentive Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Maximum number of shares awarded as restricted stock	75,000	'	'
Options and stock appreciation rights in calendar year	50,000	'	'
Stock Based Compensation Expense	$2,797,000	$2,298,000	$2,067,000
Income tax benefit	409,000	607,000	759,000
Options granted period	'10 years	'	'
Option vested	'One-fourth	'	'
Subsequent period of options granted	'4 years	'	'
Option Price Upper limit	$71.35	'	'
Option Price lower limit	$32.57	'	'
Intrinsic value of options exercised	513,000	682,000	1,626,000
Vesting period of restricted stock units	'4 years	'	'
2002 Stock Incentive Plan [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Number of shares available for issuance under the 2002 plan	1,800,000	'	'
Number of shares available for award under 2002 plan	900,181	'	'
Cash Incentive Compensation Plan [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Expenses towards cash incentive awards	2,549,000	2,014,000	71,000
Accrued provisions for cash incentive awards	2,631,000	1,973,000	'
Stock Options [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested stock	993,000	'	'
Cost recognized over a weighted-average period	'1 year 6 months	'	'
Nonvested Restricted Stock [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested stock	2,292,000	'	'
Cost recognized over a weighted-average period	'1 year 8 months 12 days	'	'
Nonvested Restricted Stock Performance Units [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested stock	$1,963,000	'	'
Cost recognized over a weighted-average period	'1 year 8 months 12 days	'	'
Other Stock Based Awards [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Other stock-based awards	0	'	'

Incentive_Plans_Valuation_of_S

Incentive Plans - Valuation of Stock Options and Restricted Stock Performance Units (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Expected term of options (in years)	'6 years 3 months 7 days	'6 years 3 months 7 days	'6 years 3 months 7 days
Weighted expected volatility	37.78%	38.78%	36.70%
Dividend yield	0.58%	0.61%	0.62%
Risk-free interest rate - performance restricted shares	0.60%	0.60%	2.09%
Risk-free interest rate - stock options	1.98%	2.00%	3.79%
Stock price as of valuation date	$71.35	$67.67	$63.54
Restricted performance share valuation	$87.74	$90.61	$85.56
Grant date fair value - stock options	$26.20	$24.92	$20.89

Incentive_Plans_Summary_of_Sto

Incentive Plans - Summary of Stock Option (Detail) (Stock Options [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013
Stock Options [Member]	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Outstanding Shares, beginning balance	125,920
Shares, Granted	24,058
Shares, Exercised	-17,979
Shares, Forfeited/expired	-543
Outstanding Shares, ending balance	131,456
Shares, Exercisable	67,626
Outstanding Weighted Average Exercise Price, beginning	$54.92
Weighted Average Exercise Price, Granted	$71.35
Weighted Average Exercise Price, Exercised	$42.26
Weighted Average Exercise Price, Forfeited/expired	$60.10
Outstanding Weighted Average Exercise Price, ending	$59.64
Outstanding Weighted Average Exercise Price, Exercisable	$53.90
Outstanding Weighted Average Remaining Contractual Term (Years), Ending	'6 years 4 months 24 days
Weighted Average Remaining Contractual Term, Exercisable	'4 years 9 months 18 days
Outstanding Aggregate Intrinsic Value, Ending	$1,174
Aggregate Intrinsic Values, Exercisable	$949

Incentive_Plans_Summary_of_Sto1

Incentive Plans - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$32.57
Range of Exercise Prices Upper Limit	$71.35
Number of Options, Options Outstanding	131,456
Number of Options, Options Exercisable	67,626
Range One [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$31
Range of Exercise Prices Upper Limit	$35
Number of Options, Options Outstanding	4,751
Average Life in Years, Options Outstanding	'4 years 8 months 12 days
Average Exercise Price, Options Outstanding	$34.25
Number of Options, Options Exercisable	4,751
Average Exercise Price, Options Exercisable	$34.25
Range Two [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$41
Range of Exercise Prices Upper Limit	$45
Number of Options, Options Outstanding	17,274
Average Life in Years, Options Outstanding	'6 years
Average Exercise Price, Options Outstanding	$44.83
Number of Options, Options Exercisable	10,309
Average Exercise Price, Options Exercisable	$44.82
Range Three [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$51
Range of Exercise Prices Upper Limit	$55
Number of Options, Options Outstanding	32,863
Average Life in Years, Options Outstanding	'2 years 9 months 18 days
Average Exercise Price, Options Outstanding	$53
Number of Options, Options Exercisable	32,863
Average Exercise Price, Options Exercisable	$53
Range Four [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$56
Range of Exercise Prices Upper Limit	$65
Number of Options, Options Outstanding	26,371
Average Life in Years, Options Outstanding	'7 years 1 month 6 days
Average Exercise Price, Options Outstanding	$63.54
Number of Options, Options Exercisable	13,194
Average Exercise Price, Options Exercisable	$63.54
Range Five [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices Lower Limit	$66
Range of Exercise Prices Upper Limit	$75
Number of Options, Options Outstanding	50,197
Average Life in Years, Options Outstanding	'8 years 7 months 6 days
Average Exercise Price, Options Outstanding	$69.43
Number of Options, Options Exercisable	6,509
Average Exercise Price, Options Exercisable	$67.67

Incentive_Plans_Summary_of_Non

Incentive Plans - Summary of Nonvested Restricted Stock (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Weighted Average Grant-Date Fair Value Nonvested, Granted	$87.74	$90.61	$85.56
Nonvested Restricted Stock [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Shares Nonvested, Beginning Balance	76,352	'	'
Shares Nonvested, Granted	23,735	'	'
Shares Nonvested, Vested	-20,229	'	'
Shares Nonvested, Forfeited	-267	'	'
Shares Nonvested, Ending Balance	79,591	'	'
Weighted Average Grant-Date Fair Value Nonvested, Beginning Balance	$52.09	'	'
Weighted Average Grant-Date Fair Value Nonvested, Granted	$71.35	'	'
Weighted Average Grant-Date Fair Value Nonvested, Vested	$34.41	'	'
Weighted Average Grant-Date Fair Value Nonvested, Forfeited	$58.22	'	'
Weighted Average Grant-Date Fair Value Nonvested, Ending Balance	$62.31	'	'

Incentive_Plans_Summary_of_Non1

Incentive Plans - Summary of Nonvested Restricted Stock Performance Units (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Weighted Average Grant-Date Fair Value Nonvested, Granted	$87.74	$90.61	$85.56
Nonvested Restricted Stock Performance Units [Member]	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Shares Nonvested, Beginning Balance	50,393	'	'
Shares Nonvested, Granted	16,427	'	'
Shares Nonvested, Vested	-13,892	'	'
Shares Nonvested, Forfeited	-303	'	'
Shares Nonvested, Ending Balance	52,625	'	'
Weighted Average Grant-Date Fair Value Nonvested, Beginning Balance	$68.30	'	'
Weighted Average Grant-Date Fair Value Nonvested, Granted	$87.74	'	'
Weighted Average Grant-Date Fair Value Nonvested, Vested	$43.48	'	'
Weighted Average Grant-Date Fair Value Nonvested, Forfeited	$77.57	'	'
Weighted Average Grant-Date Fair Value Nonvested, Ending Balance	$80.87	'	'

Supplemental_Cash_Flows_Disclo2

Supplemental Cash Flows Disclosures - Information Concerning Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]	'	'	'
Income taxes paid in cash	$11,042	$4,227	$762
Interest paid	3,547	3,571	3,607
Interest capitalized	($53)	($36)	($82)

Supplemental_Cash_Flows_Disclo3

Supplemental Cash Flows Disclosures - Non-cash Investing and Financing Activities Excluded from Statement of Cash Flow (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract]	'	'	'
Issuance of restricted stock	$935	$1,393	$1,456
Land exchanges	'	'	$87

Supplemental_Cash_Flows_Disclo4

Supplemental Cash Flows Disclosures - Increases/Decreases in Operating Working Capital Other Than Cash and Cash Equivalents (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase Decrease In Other Operating Assets And Liabilities Net [Abstract]	'	'	'
Trade accounts receivable	$2,178	($457)	($216)
Other receivables	-6	-12	97
Inventories	-2,740	-541	1,708
Prepaid expenses and other current assets	-184	963	-235
Trade accounts payable	3,701	35	-585
Accrued taxes other than income taxes	216	-19	-15
Deferred revenues and other accrued liabilities	2,718	2,486	-1,674
Other Current Assets and Liabilities, Net	$5,883	$2,455	($920)

Supplemental_Cash_Flows_Disclo5

Supplemental Cash Flows Disclosures - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Cash Flows [Abstract]	'	'	'
Deferred long-term mineral lease	$1,635,000	$1,767,000	$538,000
Total cash payment received from deferred mineral lease rental	$30,000	$450,000	$1,932,000

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Earnings Per Share (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Earnings Per Share [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net earnings allocated to common stock

'

'

'

'

'

'

'

'

'

'

'

'

$25,924

$9,144

$2,644

Net earnings allocated to participating securities

'

'

'

'

'

'

'

'

'

'

'

'

268

91

15

Net income

$2,337

$5,813

$11,268

$6,774

$2,404

$3,218

$3,516

$97

($208)

$720

$2,055

$92

$26,192

$9,235

$2,659

Weighted average number of common shares used in basic EPS

'

'

'

'

'

'

'

'

'

'

'

'

12,566

12,525

12,450

Effect of dilutive stock awards

'

'

'

'

'

'

'

'

'

'

'

'

58

63

102

Weighted average number of common shares and dilutive potential common stock used in EPS assuming dilution

'

'

'

'

'

'

'

'

'

'

'

'

12,624

12,588

12,552

Earnings per common share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basic

$0.18

$0.46

$0.89

$0.53

$0.19

$0.25

$0.28

$0.01

($0.02)

$0.06

$0.16

$0.01

$2.06

$0.73

$0.21

Assuming dilution

$0.18

$0.46

$0.88

$0.53

$0.19

$0.25

$0.28

$0.01

($0.02)

$0.06

$0.16

$0.01

$2.05

$0.73

$0.21

Earnings_Per_Share_Information

Earnings Per Share - Information about Potentially Dilutive Securities Outstanding (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Anti-dilutive shares outstanding not included in the computation of diluted earnings per share	50,197	26,459	26,993
Restricted Performance Shares [Member]	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Anti-dilutive shares outstanding not included in the computation of diluted earnings per share	52,625	29,831	14,013

Contingencies_and_Commitments_

Contingencies and Commitments - Additional Information (Detail) (USD $)	Dec. 31, 2013
Property, Plant and Equipment [Member]	'
Contingencies And Commitments [Line Items]	'
Commitments for capital expenditures	$3,978,000
Investment in Real Estate [Member]	'
Contingencies And Commitments [Line Items]	'
Commitments for capital expenditures	$94,000

Gain_on_Involuntary_Conversion1

Gain on Involuntary Conversion - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Gain On Involuntary Conversion [Abstract]	'
Proceeds from insurance settlement	$881,000

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
	Real_Estate
	Segment
	Sawmills
Segment Reporting [Abstract]	'
Number of reporting segments	4
Number of business units	3
Number of sawmills	2
Real estate developments	3

Business_Segments_Summary_of_C

Business Segments - Summary of Company's Business Segments (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2011

Jun. 30, 2011

Mar. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

$48,372

$56,520

$53,247

$41,563

$36,665

$36,499

$37,105

$30,639

$28,813

$31,371

$32,268

$29,395

$199,702

$140,908

$121,847

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

4,525

9,599

10,991

10,548

4,635

5,104

6,259

1,134

1,206

2,116

3,587

550

35,663

17,132

7,459

Equity in earnings of Del-Tin Fiber2

'

'

'

'

'

'

'

'

'

'

'

'

1,084

959

318

Interest income

'

'

'

'

'

'

'

'

'

'

'

'

13

17

38

Interest and other debt expense, net of capitalized interest

'

'

'

'

'

'

'

'

'

'

'

'

-4,578

-4,092

-4,029

Gain on bargain purchase

128

'

3,285

'

'

'

'

'

'

'

'

'

3,413

'

'

Other income

'

'

'

'

'

'

'

'

'

'

'

'

3,229

20

3

Income before income taxes

'

'

'

'

'

'

'

'

'

'

'

'

38,824

14,036

3,789

Total assets at year-end

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at year-end

411,344

'

'

'

353,209

'

'

'

341,870

'

'

'

411,344

353,209

341,870

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

15,131

10,642

11,806

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

33,568

24,034

15,697

Operating Segments [Member] | Woodlands [Member]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

33,834

37,285

40,240

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

'

'

'

'

'

'

'

'

'

'

'

'

16,749

18,374

20,416

Total assets at year-end

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at year-end

247,156

'

'

'

240,026

'

'

'

227,102

'

'

'

247,156

240,026

227,102

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

4,785

4,786

5,291

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

12,755

18,553

7,817

Operating Segments [Member] | Manufacturing [Member]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

167,955

105,956

83,889

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

'

'

'

'

'

'

'

'

'

'

'

'

38,496

18,083

1,011

Total assets at year-end

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at year-end

85,837

'

'

'

30,136

'

'

'

33,801

'

'

'

85,837

30,136

33,801

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

9,910

5,378

5,999

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

16,532

2,478

3,570

Operating Segments [Member] | Real Estate [Member]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

11,734

10,992

12,358

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

'

'

'

'

'

'

'

'

'

'

'

'

-1,430

-2,099

-75

Total assets at year-end

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at year-end

59,549

'

'

'

58,783

'

'

'

59,304

'

'

'

59,549

58,783

59,304

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

343

374

427

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

4,267

2,996

4,223

Operating Segments [Member] | Corporate [Member]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

'

'

'

'

'

'

'

'

'

'

'

'

-17,994

-17,394

-14,293

Total assets at year-end

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets at year-end

18,802

'

'

'

24,264

'

'

'

21,663

'

'

'

18,802

24,264

21,663

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation, amortization, and cost of fee timber harvested

'

'

'

'

'

'

'

'

'

'

'

'

93

104

89

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

'

'

'

'

'

'

'

'

'

'

14

7

87

Eliminations [Member]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales

'

'

'

'

'

'

'

'

'

'

'

'

-13,821

-13,325

-14,640

Operating income/(loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating income

'

'

'

'

'

'

'

'

'

'

'

'

($158)

$168

$400

Business_Segments_Summary_of_C1

Business Segments - Summary of Company's Business Segments (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Segment Reporting [Abstract]	'	'	'
Investment in Del-Tin Fiber	'	$6,293	$7,113
Sale proceeds of timberland	$0	$7	$567

Financial_Results_by_Quarter_U2

Financial Results by Quarter (Unaudited) - Quarterly Financial Results (Detail) (USD $)	3 Months Ended												12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net sales	$48,372	$56,520	$53,247	$41,563	$36,665	$36,499	$37,105	$30,639	$28,813	$31,371	$32,268	$29,395	$199,702	$140,908	$121,847
Gross profit	8,977	14,810	14,648	15,384	9,388	10,237	10,205	5,730	5,117	5,847	6,856	4,896	53,819	35,560	22,716
Operating income	4,525	9,599	10,991	10,548	4,635	5,104	6,259	1,134	1,206	2,116	3,587	550	35,663	17,132	7,459
Net income	$2,337	$5,813	$11,268	$6,774	$2,404	$3,218	$3,516	$97	($208)	$720	$2,055	$92	$26,192	$9,235	$2,659
Earnings per common share	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Basic	$0.18	$0.46	$0.89	$0.53	$0.19	$0.25	$0.28	$0.01	($0.02)	$0.06	$0.16	$0.01	$2.06	$0.73	$0.21
Assuming dilution	$0.18	$0.46	$0.88	$0.53	$0.19	$0.25	$0.28	$0.01	($0.02)	$0.06	$0.16	$0.01	$2.05	$0.73	$0.21
Dividends paid per common share	$0.10	$0.10	$0.10	$0.10	$0.08	$0.08	$0.08	$0.08	$0.08	$0.08	$0.08	$0.08	$0.40	$0.30	$0.30

Financial_Results_by_Quarter_U3

Financial Results by Quarter (Unaudited) - Quarterly Financial Results (Parenthetical) (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'	'	'
Gain on bargain purchase	$128	$3,285	$3,413
Gain on previously held equity investment	'	$3,165	$3,165