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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 72,593 $ 77,987
Restricted cash and cash equivalents 4,713 5,354
Accounts and other receivables, net 12,530 12,049
Inventories, net 11,890 11,223
Prepaid expenses and other 1,514 1,769
Deferred income taxes 4,271 4,271
Total current assets 107,511 112,653
Other assets:    
Marketable securities 230,686 179,662
Investment in Kronos Worldwide, Inc. 298,955 323,128
Goodwill 27,156 27,156
Other assets, net 2,255 3,854
Total other assets 559,052 533,800
Property and equipment:    
Land 5,138 5,138
Buildings 20,791 20,791
Equipment 56,660 59,010
Construction in progress 1,686 1,442
Property and equipment, gross 84,275 86,381
Less accumulated depreciation 50,307 52,052
Net property and equipment 33,968 34,329
Total assets 700,531 680,782
Current liabilities:    
Current maturities of long-term debt 1,000 1,000
Accounts payable 4,434 5,363
Accrued and other current liabilities 9,420 12,749
Accrued environmental remediation and related costs 5,115 5,667
Income taxes 4 6
Total current liabilities 19,973 24,785
Noncurrent liabilities:    
Long-term debt 17,230 17,480
Accrued pension costs 13,061 13,747
Accrued postretirement benefit (OPEB) costs 3,718 3,861
Accrued environmental remediation and related costs 43,374 42,339
Deferred income taxes 175,787 171,915
Other 18,522 18,572
Total noncurrent liabilities 271,692 267,914
NL Stockholders' equity:    
Common stock 6,083 6,083
Additional paid-in capital 300,230 300,227
Retained earnings 155,557 163,758
Accumulated other comprehensive loss (66,187) (95,253)
Total NL stockholders' equity 395,683 374,815
Noncontrolling interest in subsidiary 13,183 13,268
Total equity 408,866 388,083
Total liabilities and equity 700,531 680,782
Commitments and contingencies (Notes 13 and 14)