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Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation $ 443us-gaap_AllocatedShareBasedCompensationExpense $ 1,086us-gaap_AllocatedShareBasedCompensationExpense
2011 LTIP [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember		 1,014us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandElevenLongTermIncentivePlanMember
2015 LTIP [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation 350us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_TwoThousandFifteenLongTermIncentivePlanMember
Board of Directors Compensation [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation $ 93us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_BoardOfDirectorsMember		 $ 72us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= spok_BoardOfDirectorsMember