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Stockholders' Equity - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 34 Months Ended 0 Months Ended
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Jan. 01, 2015
Dec. 09, 2014
Dec. 31, 2014
Apr. 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock authorized 75,000,000us-gaap_CommonStockSharesAuthorized     75,000,000us-gaap_CommonStockSharesAuthorized   75,000,000us-gaap_CommonStockSharesAuthorized        
Common stock par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare     $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare   0.0001us-gaap_CommonStockParOrStatedValuePerShare        
Preferred stock authorized 25,000,000us-gaap_PreferredStockSharesAuthorized     25,000,000us-gaap_PreferredStockSharesAuthorized   25,000,000us-gaap_PreferredStockSharesAuthorized        
Preferred stock par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare     $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare   0.0001us-gaap_PreferredStockParOrStatedValuePerShare        
Common stock outstanding 21,739,412us-gaap_CommonStockSharesOutstanding     21,739,412us-gaap_CommonStockSharesOutstanding   21,739,412us-gaap_CommonStockSharesOutstanding     21,978,762us-gaap_CommonStockSharesOutstanding  
Preferred stock outstanding 0us-gaap_PreferredStockSharesOutstanding     0us-gaap_PreferredStockSharesOutstanding   0us-gaap_PreferredStockSharesOutstanding     0us-gaap_PreferredStockSharesOutstanding  
Total stock based compensation       $ 443,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,086,000us-gaap_AllocatedShareBasedCompensationExpense          
Declaration date       Apr. 29, 2015            
Record Date       May 22, 2015            
Payment Date       Jun. 25, 2015            
Total number of shares purchased 230,532us-gaap_TreasuryStockSharesAcquired 1,234us-gaap_TreasuryStockSharesAcquired 16,031us-gaap_TreasuryStockSharesAcquired 247,797us-gaap_TreasuryStockSharesAcquired            
Expected amount for dividends and/or common stock repurchases 26,000,000spok_ExpectedAmountForDividendsAndOrCommonStockRepurchases     26,000,000spok_ExpectedAmountForDividendsAndOrCommonStockRepurchases   26,000,000spok_ExpectedAmountForDividendsAndOrCommonStockRepurchases        
Increase (decrease) in additional paid-in capital       (4,000,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther            
Additional paid-in capital 122,704,000us-gaap_AdditionalPaidInCapitalCommonStock     122,704,000us-gaap_AdditionalPaidInCapitalCommonStock   122,704,000us-gaap_AdditionalPaidInCapitalCommonStock     126,678,000us-gaap_AdditionalPaidInCapitalCommonStock  
Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Dividend rate                   $ 0.125us-gaap_DividendsPayableAmountPerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Dividends declared                   2,700,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Common Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted, Shares           5,820us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
       
Non-executive directors [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted, Shares           60,290us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorsMember
       
2015 LTIP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total stock based compensation       350,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
         
2015 LTIP [Member] | Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period               36 months    
Granted, Shares       254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
  254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
     
Granted, Value             4,400,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
     
Shares outstanding 254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
    254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
  254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
    0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
 
2015 LTIP [Member] | Common Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted, Shares             254,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
     
Common Stock Repurchase Program [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock repurchase authority             15,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember
     
Total number of shares purchased 10,202us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember
1,234us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember
16,031us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember
27,467us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember
           
Treasury stock acquired, value       $ 500,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember