Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) (USD $)	3 Months Ended
Mar. 31, 2015 lease	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Asset retirement obligations	$ 6,910,000	$ 6,805,000
Dividends payable - 2015 LTIP	32,000	0
Escheat liability	145,000spok_LongTermEscheatLiability	220,000spok_LongTermEscheatLiability
Capital lease payable	3,000us-gaap_CapitalLeaseObligations	6,000us-gaap_CapitalLeaseObligations
Lease incentive	587,000	426,000
Deferred rent	387,000spok_DeferredRent	404,000spok_DeferredRent
Royalty payable	270,000spok_RoyaltyPayableNoncurrent	270,000spok_RoyaltyPayableNoncurrent
Total other long-term liabilities	8,334,000us-gaap_OtherLiabilitiesNoncurrent	8,131,000us-gaap_OtherLiabilitiesNoncurrent
Increase in lease incentives	$ 200,000
Number of corporate leases	2

Amount of deferred compensation paid by a tenant to the property owner use or occupancy of a property.

No definition available.

Name:	spok_DeferredRent
Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Increase (Decrease) in Lease Incentive Costs

+ References

No definition available.

+ Details

Name:	spok_IncreaseDecreaseinLeaseIncentiveCosts
Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Lessee Leasing Arrangements, Operating Leases, Number of Leases

+ References

No definition available.

+ Details

Name:	spok_LesseeLeasingArrangementsOperatingLeasesNumberofLeases
Namespace Prefix:	spok_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for property or monies of a owner who dies without heirs to the crown or state, or when a bank account remain inactive and the efforts to contact the owner prove unsuccessful. Used to reflect the noncurrent portion of the liabilities (due one year or more than the normal operating cycle if longer).

+ References

No definition available.

+ Details

Name:	spok_LongTermEscheatLiability
Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Dividends payable to employees for their services who are part of a long term incentive plan.

+ References

No definition available.

+ Details

Name:	spok_LongTermIncentivePlanDividendsPayable
Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Royalty payable noncurrent.

+ References

No definition available.

+ Details

Name:	spok_RoyaltyPayableNoncurrent
Namespace Prefix:	spok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This item represents an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant