Stockholders' Equity - Stock Based Compensation Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Decrease in stock based compensation expense	$ 2.0
Percent of awards issued expected to vest	50.00%

Share-based Compensation Arrangement by Share-based Payment Award, Percent of Awards Issued Expected to Vest

No definition available.

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Namespace Prefix:	spok_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant