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Asset Retirement Obligations - Additional Information (Details) $ in Millions | Sep. 30, 2021 USD ($)
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Asset Retirement Obligation Disclosure [Abstract] |
Estimated liability | $ 9.3

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- Definition Asset Retirement Obligation, Estimated Liability, Removal Costs and Timing Refinements + References No definition available. + Details
Name: | spok_AssetRetirementObligationEstimatedLiabilityRemovalCostsAndTimingRefinements
Namespace Prefix: | spok_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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