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Operating Leases - Operating Lease Expense Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating lease expense components: |  |  |
Leases with initial term of greater than 12 months | $ 9,412 | $ 12,564 | $ 11,972
Leases with initial term of 12 months or less | 4,232 | 4,024 | 5,906
Total operating lease expense | $ 13,644 | $ 16,588 | $ 17,878

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- Definition Operating Lease, Expense, Current + References No definition available. + Details
Name: | ois_OperatingLeaseExpenseCurrent
Namespace Prefix: | ois_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Lease, Expense, Noncurrent + References No definition available. + Details
Name: | ois_OperatingLeaseExpenseNoncurrent
Namespace Prefix: | ois_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeaseCostAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration