Spin-off of Apergy Corporation (Detail) € in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 EUR (€)	May 09, 2018 USD ($)
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)		(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		$ 300,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%		6.375%
Debt Instrument, Unused Borrowing Capacity, Amount	$ 415,000		$ 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		$ 32,928