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Related Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 02, 2020 | Nov. 30, 2016 | Nov. 14, 2016 | Aug. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Notes receivable from affiliate | $ 28,100,000 | $ 34,000,000 |  |  |  |  |
Contran | Kronos |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Rent and related ancillary service | 100,000 |  |  |  |  |  |
Contran | Intercorporate Services Agreement Fees |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expense transaction with affiliate | 36,100,000 | 32,000,000 | $ 24,500,000 |  |  |  |
Contran | Combined Information Technology Data Recovery Program |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expense transaction with affiliate | 2,000,000 | 3,000,000 | 2,000,000 |  |  |  |
Tall Pines and EWI | Insurance Premiums |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expense transaction with affiliate | 14,900,000 | 12,600,000 | 11,800,000 |  |  |  |
NLKW Holding, LLC | Valhi | Valhi Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Borrowing under credit facility |  |  |  |  | $ 50,000,000 | $ 50,000,000 |
Outstanding borrowings | $ 500,000 | 500,000 |  |  |  |  |
CompX | Valhi Inc | Unsecured Revolving Promissory Note Receivable |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Maximum loan amount |  |  |  |  |  |  | $ 40,000,000
Interest rate on loans repayment |  |  |  |  |  |  | 1.00%
Interest rate on loans basis | prime plus 1.00% |  |  |  |  |  |
Notes receivable from affiliate | $ 28,100,000 | 34,000,000 |  |  |  |  |
Interest income including unused commitment fees | $ 2,400,000 | $ 2,100,000 | $ 1,800,000 |  |  |  |
CompX | Valhi Inc | Unsecured Revolving Promissory Note Receivable | Subsequent Event |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Outstanding borrowings |  |  |  | $ 5,700,000 |  |  |
Notes receivable from affiliate |  |  |  | $ 33,800,000 |  |  |

X
- Definition Maximum lending capacity under the terms noted per the related party credit facility. + References No definition available. + Details
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Namespace Prefix: | nl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Rent and related ancillary service cost. + References No definition available. + Details
Name: | nl_RentAndRelatedAncillaryServiceCost
Namespace Prefix: | nl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56071-112765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(3)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(11)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996 + Details
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- Definition Amount of interest income earned from interest-bearing assets owed to the entity by related party. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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Balance Type: | na
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- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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