CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 20,745us-gaap_NetIncomeLoss	$ 27,530us-gaap_NetIncomeLoss	$ 26,984us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	16,677	15,167	18,232
Impairment	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	3,382us-gaap_AssetImpairmentCharges
Amortization of deferred financing costs	456us-gaap_AmortizationOfFinancingCosts	258us-gaap_AmortizationOfFinancingCosts	259us-gaap_AmortizationOfFinancingCosts
Deferred income tax expense	4,740us-gaap_DeferredIncomeTaxExpenseBenefit	16,276us-gaap_DeferredIncomeTaxExpenseBenefit	18,040us-gaap_DeferredIncomeTaxExpenseBenefit
Stock based compensation	3,838us-gaap_ShareBasedCompensation	3,045us-gaap_ShareBasedCompensation	1,224us-gaap_ShareBasedCompensation
Provisions for doubtful accounts, service credits and other	1,128	1,955	1,962
Adjustments of non-cash transaction taxes	(310)spok_NoncashSalesAndUseTax	(474)spok_NoncashSalesAndUseTax	(480)spok_NoncashSalesAndUseTax
Loss/(Gain) on disposals of property and equipment	3	21	(160)
Changes in assets and liabilities:
Accounts receivable	(8,013)	1,542	(3,008)
Prepaid expenses, intangible assets and other assets	17	(1,215)	(318)
Accounts payable, accrued liabilities and other	1,192	(6,855)	2,375
Customer deposits and deferred revenue	1,086	(6,794)	4,385
Net cash provided by operating activities	41,559	50,456	72,877
Cash flows from investing activities:
Purchases of property and equipment	(7,679)	(10,408)	(9,989)
Proceeds from disposals of property and equipment	65	293	330
Acquisitions, net of cash acquired	0	0	(3,000)
Net cash used in investing activities	(7,614)	(10,115)	(12,659)
Cash flows from financing activities:
Repayment of debt	0us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt	(28,250)us-gaap_RepaymentsOfLongTermDebt
Cash distributions to stockholders	(10,826)us-gaap_PaymentsOfDividendsCommonStock	(12,312)us-gaap_PaymentsOfDividendsCommonStock	(16,512)us-gaap_PaymentsOfDividendsCommonStock
Purchase of common stock (including commissions)	(4,325)	0	(8,065)
Net cash used in financing activities	(15,151)	(12,312)	(52,827)
Net increase in cash and cash equivalents	18,794	28,029	7,391
Cash and cash equivalents, beginning of period	89,075	61,046	53,655
Cash and cash equivalents, end of period	107,869	89,075	61,046
Supplemental disclosure:
Interest paid	8us-gaap_InterestPaid	10us-gaap_InterestPaid	288us-gaap_InterestPaid
Income taxes paid	$ 1,448us-gaap_IncomeTaxesPaidNet	$ 1,474us-gaap_IncomeTaxesPaidNet	$ 1,606us-gaap_IncomeTaxesPaidNet

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Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
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