XML 75 R63.htm IDEA: XBRL DOCUMENT
v3.19.2

Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |
Discrete Income Tax Expense (Benefit) | $ 1,200,000 | $ 2,300,000 | $ 600,000 | $ 11,200,000
Income tax expense, adjusted for discrete items | $ 33,800,000 | $ 27,000,000.0 | 64,700,000 | $ 54,300,000
Tax Assessment |  |  | 69,000,000 |
Rowan Companies [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  |  | $ 50,400,000 |

X
- 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
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_IncomeTaxReconciliationOtherAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in unrecognized tax benefits resulting from acquisitions. + References No definition available. + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Income tax expense, adjusted for discrete items + References No definition available. + Details
Name: | val_Incometaxexpenseadjustedfordiscreteitems
Namespace Prefix: | val_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Assessment + References No definition available. + Details
Name: | val_TaxAssessment
Namespace Prefix: | val_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=val_RowanCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |