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Stock Based Compensation - Stock Based Compensation Expense (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
Cost of Revenue [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation 34us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 81us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Service, Rental and Maintenance [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation 29us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= spok_ServiceRentalAndMaintenanceMember		 39us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= spok_ServiceRentalAndMaintenanceMember
Selling and Marketing [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation 51us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember		 131us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
General and Administrative [Member]    
Share based Compensation Allocation of Recognized Period Cost [Line Items]    
Total stock based compensation $ 329us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 835us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember