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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2018
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Spok Holdings, Inc. Savings and Retirement Plan The Company has a savings plan in the U.S. that qualifies under Section 401(k) of the Internal Revenue Code ("IRC"). Participating U.S. employees may elect to contribute a percentage of their salary, subject to certain limitations. Matching contributions under the savings plan were approximately $1.6 million for the year ended December 31, 2018, and $1.1 million for each of the years ended December 31, 2017 and 2016.