CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 57,943	$ 52,609
Restricted cash and cash equivalents	3,186	3,343
Accounts and other receivables, net	12,859	10,632
Inventories, net	15,875	13,235
Prepaid expenses and other	595	809
Deferred income taxes	3,786	3,786
Total current assets	94,244	84,414
Other assets:
Marketable securities	92,274	252,677
Investment in Kronos Worldwide, Inc.	283,375	284,523
Goodwill	27,156	27,156
Other assets, net	2,960	2,707
Deferred income taxes	19	19
Total other assets	405,784	567,082
Property and equipment:
Land	5,138	5,138
Buildings	20,984	20,793
Equipment	61,519	58,195
Construction in progress	598	2,588
Property and equipment, gross	88,239	86,714
Less accumulated depreciation	54,138	52,385
Net property and equipment	34,101	34,329
Total assets	534,129	685,825
Current liabilities:
Accounts payable	5,195	3,006
Accrued and other current liabilities	9,386	11,199
Accrued environmental remediation and related costs	12,457	4,859
Income taxes	8	6
Total current liabilities	27,046	19,070
Noncurrent liabilities:
Accrued pension costs	4,550	5,453
Accrued postretirement benefit (OPEB) costs	3,052	3,268
Accrued environmental remediation and related costs	105,774	108,777
Deferred income taxes	104,021	161,933
Other	18,335	18,329
Total noncurrent liabilities	235,732	297,760
NL stockholders’ equity:
Common stock	6,085	6,084
Additional paid-in capital	300,388	300,223
Retained earnings	93,316	84,089
Accumulated other comprehensive loss	(142,512)	(35,016)
Total NL stockholders’ equity	257,277	355,380
Noncontrolling interest in subsidiary	14,074	13,615
Total equity	271,351	368,995
Total liabilities and equity	534,129	685,825
Commitments and contingencies (Notes 12 and 13)