Label	Element	Value
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	$ 936,000
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1,115,000
Stock Purchased During Period, Value, Tax Withholding	spok_StockPurchasedDuringPeriodValueTaxWithholding	1,245,000
Stock Purchased During Period, Value, Tax Withholding	spok_StockPurchasedDuringPeriodValueTaxWithholding	1,209,000
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	64,259,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	70,645,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	77,986,000
Dividends, Cash	us-gaap_DividendsCash	6,513,000
Dividends, Cash	us-gaap_DividendsCash	6,549,000
Net Income (Loss) Attributable to Parent	us-gaap_NetIncomeLoss	3,117,000
Net Income (Loss) Attributable to Parent	us-gaap_NetIncomeLoss	(7,214,000)
Common Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	2,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	2,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 2,000
Stock Purchased During Period, Shares, Tax Withholding	spok_StockPurchasedDuringPeriodSharesTaxWithholding	144,516
Stock Purchased During Period, Shares, Tax Withholding	spok_StockPurchasedDuringPeriodSharesTaxWithholding	134,354
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	346,604
Additional Paid-In Capital And Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 95,634,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	97,702,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	95,703,000
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	936,000
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1,115,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	25,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12,000
Stock Purchased During Period, Value, Tax Withholding	spok_StockPurchasedDuringPeriodValueTaxWithholding	1,245,000
Stock Purchased During Period, Value, Tax Withholding	spok_StockPurchasedDuringPeriodValueTaxWithholding	$ 1,209,000