Commitments and Contingencies - Purchase Commitment (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Mar. 31, 2014 Paging Equipment Assets [Member]	Apr. 30, 2014 Information Technology Services [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Period	3 years	3 years
Long-term Purchase Commitment, Amount	$ 8.3	$ 1.6

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	spok_LongtermPurchaseCommitmentPeriod
Namespace Prefix:	spok_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration