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Asset Retirement Obligations - Additional Information (Details) $ in Millions	Sep. 30, 2021 USD ($)
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

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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