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Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended 39 Months Ended 0 Months Ended 31 Months Ended 0 Months Ended
Jan. 02, 2014
Aug. 01, 2012
Mar. 15, 2011
Jan. 03, 2011
Jan. 02, 2010
Jan. 02, 2009
Jul. 31, 2008
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2014
Mar. 05, 2015
Jan. 02, 2015
Apr. 19, 2013
Apr. 26, 2013
Jul. 08, 2014
Dec. 31, 2014
Jan. 06, 2009
Apr. 07, 2011
Jul. 23, 2013
May 16, 2012
Mar. 04, 2015
Jul. 30, 2012
Dec. 13, 2013
Employees
Dec. 27, 2012
Employees
Aug. 01, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Granted, shares                 7,110us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 6,006us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 5,093us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 6,475us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 6,266us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 4,606us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 4,712us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 5,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 5,263us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 4,084us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 3,769us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 3,785us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod         62,519us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod                              
Common stock authorized               75,000,000us-gaap_CommonStockSharesAuthorized       75,000,000us-gaap_CommonStockSharesAuthorized                 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized   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 $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare   $ 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 25,000,000us-gaap_PreferredStockSharesAuthorized   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 $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare           0.0001us-gaap_PreferredStockParOrStatedValuePerShare                  
Stock options outstanding               0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber                 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber           0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber                  
Common stock outstanding               21,978,762us-gaap_CommonStockSharesOutstanding       21,652,341us-gaap_CommonStockSharesOutstanding                 21,978,762us-gaap_CommonStockSharesOutstanding 21,652,341us-gaap_CommonStockSharesOutstanding   21,652,341us-gaap_CommonStockSharesOutstanding 21,978,762us-gaap_CommonStockSharesOutstanding           21,978,762us-gaap_CommonStockSharesOutstanding                  
Preferred stock outstanding               0us-gaap_PreferredStockSharesOutstanding       0us-gaap_PreferredStockSharesOutstanding                 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding   0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding           0us-gaap_PreferredStockSharesOutstanding                  
Common Stock Repurchase Program, authorized amount $ 15,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount $ 25,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount   $ 25,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount $ 25,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount $ 25,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount $ 50,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount                                                                  
Common stock repurchased, shares               6,532,276us-gaap_TreasuryStockShares                         6,532,276us-gaap_TreasuryStockShares       6,532,276us-gaap_TreasuryStockShares           6,532,276us-gaap_TreasuryStockShares                  
Common stock purchases, value               64,100,000us-gaap_TreasuryStockValue                         64,100,000us-gaap_TreasuryStockValue       64,100,000us-gaap_TreasuryStockValue           64,100,000us-gaap_TreasuryStockValue                  
Additional paid-in capital               126,700,000us-gaap_AdditionalPaidInCapital       127,300,000us-gaap_AdditionalPaidInCapital       125,200,000us-gaap_AdditionalPaidInCapital         126,700,000us-gaap_AdditionalPaidInCapital 127,300,000us-gaap_AdditionalPaidInCapital 125,200,000us-gaap_AdditionalPaidInCapital 127,300,000us-gaap_AdditionalPaidInCapital 126,700,000us-gaap_AdditionalPaidInCapital           126,700,000us-gaap_AdditionalPaidInCapital                  
Adjustments to Additional Paid in Capital, Other                                         600,000us-gaap_AdjustmentsToAdditionalPaidInCapitalOther 2,100,000us-gaap_AdjustmentsToAdditionalPaidInCapitalOther                                    
Purchased and retired common stock, shares                           108,459us-gaap_StockRepurchasedAndRetiredDuringPeriodShares                                                    
Shares acquired under common stock repurchase program               263,772us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 108,459us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 277,191us-gaap_TreasuryStockSharesAcquired 434,982us-gaap_TreasuryStockSharesAcquired 0us-gaap_TreasuryStockSharesAcquired 21,657us-gaap_TreasuryStockSharesAcquired   263,772us-gaap_TreasuryStockSharesAcquired 108,459us-gaap_TreasuryStockSharesAcquired 733,830us-gaap_TreasuryStockSharesAcquired 1,106,061us-gaap_TreasuryStockSharesAcquired                                
Treasury Stock, Value, Acquired, Cost Method                                         4,300,000us-gaap_TreasuryStockValueAcquiredCostMethod                                      
Maximum equity securities available under 2012 Equity Plan               1,747,586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant                         1,747,586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant       1,747,586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant           1,747,586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant       2,194,986us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant          
Amortized period     45 months                                                                          
Restricted stock units awarded to certain eligible employees                                             338,834spok_RestrictedStockAndUnitAwardsIssued                                  
Total stock based compensation                                         3,838,000us-gaap_AllocatedShareBasedCompensationExpense 3,045,000us-gaap_AllocatedShareBasedCompensationExpense 1,224,000us-gaap_AllocatedShareBasedCompensationExpense                                  
Non-Executive Directors Restricted Stock Units RSU [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Total stock based compensation                                         300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= spok_NonExecutiveDirectorsRestrictedStockUnitsRSUsMember		 200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= spok_NonExecutiveDirectorsRestrictedStockUnitsRSUsMember		 200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= spok_NonExecutiveDirectorsRestrictedStockUnitsRSUsMember		                                  
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures                                             600,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited
/ us-gaap_AwardTypeAxis
= spok_NonExecutiveDirectorsRestrictedStockUnitsRSUsMember		                                  
Restricted Stock [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period                                         1 year                                      
Payroll and related expense [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Total stock based compensation                                           3,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= spok_PayrollAndOtherExpenseMember		                                    
Subsequent Event [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Dividend Declaration Date                                                   Mar. 04, 2015                            
Dividend rate                                                                       $ 0.125us-gaap_DividendsPayableAmountPerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		        
Dividends declared                                                   2,700,000spok_CashDividendPaid
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                            
Common Stock Repurchase Program, authorized amount                                                     15,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                          
Maximum [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Dividend rate                                                                         $ 0.250us-gaap_DividendsPayableAmountPerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
2004 Equity Plan [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Equity securities approved under the 2004 Equity Plan               1,878,976us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                         1,878,976us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		       1,878,976us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		           1,878,976us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                  
Maximum equity securities available under 2012 Equity Plan               72,109us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                         72,109us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		       72,109us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		           72,109us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                  
RSU converted into common stock                                                       258,730us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                        
2004 Equity Plan [Member] | Restricted Stock Units [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Dividends and Interest Paid                                                         1,500,000us-gaap_DividendsAndInterestPaid
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandFourEquityIncentivePlanMember		                      
2012 Equity Plan [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Equity securities available under the 2004 Equity Plan                                                                     894,986spok_TransferOfAvailableEquitySecuritiesFromAnotherPlan
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		          
Equity securities granted                                                                     1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		          
2012 Equity Plan [Member] | 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
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		 5,820us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		                  
Stock Granted, Value, Share-based Compensation, Gross                                                           100,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		                    
Share Price                                                           $ 15.74us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		                    
Total stock based compensation                                         100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandTwelveEquityPlanMember		                                      
2009 LTIP [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Amortized period                                           48 months                   48 months                
Amortization of share based compensation                       3,100,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                   3,100,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		   3,100,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                                
Total stock based compensation                                         0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		 900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                                  
2009 LTIP [Member] | Restricted Stock Units [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Restricted stock units and cash dividends forfeited                               80,104spok_StockIssuedSharesRestrictedStockUnitsAwardAndCashDividendForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		             80,104spok_StockIssuedSharesRestrictedStockUnitsAwardAndCashDividendForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number                               258,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		             258,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                                  
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards                                                         3,000,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                      
2009 LTIP [Member] | Payroll and related expense [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Total stock based compensation                                           900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= spok_PayrollAndOtherExpenseMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandNineLongTermIncentivePlanMember		                                    
2011 Long Term Incentive Plan [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Amortization of share based compensation                       200,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		       200,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		           200,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 200,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 200,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                             1,600,000spok_AmortizationOfShareBasedCompensation
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		  
Total stock based compensation                                         3,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 2,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
RSUs at fair value                                           5,200,000spok_RestrictedStockUnitsAtFairValue
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 1,300,000spok_RestrictedStockUnitsAtFairValue
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
Number of employees affected due to modification                                                                           51dei_EntityNumberOfEmployees
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 18dei_EntityNumberOfEmployees
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		  
Fair value of RSUs, net of forfeitures                                         600,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 500,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                    
2011 Long Term Incentive Plan [Member] | Software Operations [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
RSUs at fair value                                                                 3,000,000spok_RestrictedStockUnitsAtFairValue
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember
/ us-gaap_StatementBusinessSegmentsAxis
= spok_SoftwareOperationsMember		              
Closing price of common stock                                                                 $ 15.68us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember
/ us-gaap_StatementBusinessSegmentsAxis
= spok_SoftwareOperationsMember		              
2011 Long Term Incentive Plan [Member] | Restricted Stock Units [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Granted, shares                                         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                   557,484us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                  
Restricted stock units and cash dividends forfeited                               101,294spok_StockIssuedSharesRestrictedStockUnitsAwardAndCashDividendForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		             101,294spok_StockIssuedSharesRestrictedStockUnitsAwardAndCashDividendForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number               0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		       617,027us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		       232,966us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 617,027us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 232,966us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 617,027us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		           0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                  
Restricted stock units awarded to certain eligible employees                                           434,811us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 122,673us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
Fair value of restricted stock units and cash dividends forfeited                                             1,400,000spok_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNetFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
RSUs, forfeited                                           50,750us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                    
Forfeited, shares                                         57,338us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                   209,382us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number               559,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                         559,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		       559,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		           559,689us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                  
2011 Long Term Incentive Plan [Member] | Restricted Stock Units [Member] | Software Operations [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Restricted stock units awarded to certain eligible employees                                                                 211,587us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember
/ us-gaap_StatementBusinessSegmentsAxis
= spok_SoftwareOperationsMember		              
2011 Long Term Incentive Plan [Member] | Forfeited [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Total stock based compensation                                             400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= spok_ForfeitedMember
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		                                  
Executive [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Number of departed employees                                             2spok_NumberofDepartedEmployees
/ us-gaap_TitleOfIndividualAxis
= spok_ExecutiveMember		                                  
Chairperson Of Audit Committee [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Deferred Compensation Cash-based Arrangements, Annual Payment Amount                                                                   55,000spok_DeferredCompensationCashbasedArrangementsAnnualPaymentAmount
/ us-gaap_TitleOfIndividualAxis
= spok_ChairpersonOfAuditCommitteeMember		           50,000spok_DeferredCompensationCashbasedArrangementsAnnualPaymentAmount
/ us-gaap_TitleOfIndividualAxis
= spok_ChairpersonOfAuditCommitteeMember
Share Based Compensation Arrangement By Share Based Payment Value Of Shares Require To Held                                                                   165,000spok_ShareBasedCompensationArrangementByShareBasedPaymentValueOfSharesRequireToHeld
/ us-gaap_TitleOfIndividualAxis
= spok_ChairpersonOfAuditCommitteeMember		            
Non-Executive Director [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Deferred Compensation Cash-based Arrangements, Annual Payment Amount                                                                   45,000spok_DeferredCompensationCashbasedArrangementsAnnualPaymentAmount
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorMember		           40,000spok_DeferredCompensationCashbasedArrangementsAnnualPaymentAmount
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorMember
Share Based Compensation Arrangement By Share Based Payment Value Of Shares Require To Held                                                                   135,000spok_ShareBasedCompensationArrangementByShareBasedPaymentValueOfSharesRequireToHeld
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorMember		            
Non Executive Directors [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Grace Period Of Restricted Stock Threshold                                         3 years                                      
Non Executive Directors [Member] | Restricted Stock [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Granted, shares                                                             54,965us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorsMember		                  
Forfeited, shares                                                             3,189us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorsMember		                  
Former Non Executive Director [Member] [Member] | Restricted Stock [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Forfeited, shares                                                                   3,189us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= spok_FormerNonExecutiveDirectorMemberMember		            
Director [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Number of Individuals, Elected Stock in Lieu of Cash for Services                                         0spok_NumberofIndividualsElectedStockinLieuofCashforServices
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 0spok_NumberofIndividualsElectedStockinLieuofCashforServices
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 0spok_NumberofIndividualsElectedStockinLieuofCashforServices
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                                  
Annually [Member] | Chairperson Of Audit Committee [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Deferred Compensation Share-based Arrangements, Annual Stock Award, Amount                                                                   70,000spok_DeferredCompensationSharebasedArrangementsAnnualStockAwardAmount
/ us-gaap_TitleOfIndividualAxis
= spok_ChairpersonOfAuditCommitteeMember
/ us-gaap_VestingAxis
= spok_AnnuallyMember		           50,000spok_DeferredCompensationSharebasedArrangementsAnnualStockAwardAmount
/ us-gaap_TitleOfIndividualAxis
= spok_ChairpersonOfAuditCommitteeMember
/ us-gaap_VestingAxis
= spok_AnnuallyMember
Annually [Member] | Non-Executive Director [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Deferred Compensation Share-based Arrangements, Annual Stock Award, Amount                                                                   60,000spok_DeferredCompensationSharebasedArrangementsAnnualStockAwardAmount
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorMember
/ us-gaap_VestingAxis
= spok_AnnuallyMember		           $ 40,000spok_DeferredCompensationSharebasedArrangementsAnnualStockAwardAmount
/ us-gaap_TitleOfIndividualAxis
= spok_NonExecutiveDirectorMember
/ us-gaap_VestingAxis
= spok_AnnuallyMember
Common Stock Repurchase Program [Member]                                                                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                
Shares acquired under common stock repurchase program                                         0us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= spok_CommonStockRepurchaseProgramMember