Spin-off of Apergy Corporation (Detail) € in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 EUR (€)	May 09, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents				$ 10,400
Less: Cash received from Apergy Corporation		$ 700,000
Cash received from Apergy, net of cash distributed	$ 0	689,643
Separation of Apergy		(906,815)
Stock repurchase program (dollar value of planned repurchases)		1,000,000
Apergy [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents				10,357
Current assets				462,620
Non-current assets				1,438,760
Assets held for sale				1,911,737
Current liabilities				185,354
Noncurrent liabilities				119,568
Total liabilities of discontinued operations				304,922
Net assets distributed to Apergy Corporation				1,606,815
Less: Cash received from Apergy Corporation		700,000
Net distribution to Apergy Corporation				$ 906,815
Separation of Apergy		33,000
Note due 2026 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Face Amount | €			€ 600,000
Note due 2026 [Member] | Apergy [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Face Amount		$ 300,000
Debt Instrument, Interest Rate, Stated Percentage		6.375%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 415,000
AOCI Attributable to Parent [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation of Apergy		$ 32,928