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Accrued Liabilities - Accrued Severance and Restructuring Balances (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Severance costs, Beginning Balance $ 1,474spok_AccruedSeverance $ 2,593spok_AccruedSeverance
Severance costs, Charges 1,328spok_SeveranceCostsCashCharges 965spok_SeveranceCostsCashCharges
Severance costs, Cash Paid (1,221)spok_PaymentsForSeveranceCosts (2,084)spok_PaymentsForSeveranceCosts
Severance costs, Ending Balance 1,581spok_AccruedSeverance 1,474spok_AccruedSeverance
Restructuring costs, Beginning Balance 0spok_AccruedRestructuring 0spok_AccruedRestructuring
Restructuring costs, Charges 0spok_RestructuringAndRelatedCostEstimatedAdditionalCharges 18spok_RestructuringAndRelatedCostEstimatedAdditionalCharges
Restructuring costs, Cash Paid 0spok_RestructuringCostsCashPayments (18)spok_RestructuringCostsCashPayments
Restructuring costs, Ending Balance 0spok_AccruedRestructuring 0spok_AccruedRestructuring
Total accrued severance and restructuring costs, Beginning Balance 1,474spok_SeveranceAndRestructuring 2,593spok_SeveranceAndRestructuring
Total accrued severance and restructuring costs, Charges 1,328spok_SeveranceAndRestructuringCosts 983spok_SeveranceAndRestructuringCosts
Total accrued severance and restructuring costs, Cash Paid (1,221)spok_SeveranceAndRestructuringCashPaid (2,102)spok_SeveranceAndRestructuringCashPaid
Total accrued severance and restructuring costs, Ending Balance $ 1,581spok_SeveranceAndRestructuring $ 1,474spok_SeveranceAndRestructuring