Subsequent Events (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Feb. 01, 2017 $ / shares	Jan. 31, 2017 shares	Jan. 03, 2017 USD ($)	Jul. 26, 2016 shares	Jan. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Charge to income tax expense						$ 80,652	$ (7,484)	$ 23,983
GetGo, Inc.
Subsequent Event [Line Items]
Shares issued in acquisition (shares) | shares				26,900,000
GetGo, Inc. | Subsequent Event
Subsequent Event [Line Items]
Shares issued in acquisition (shares) | shares		26,900,000
Common stock conversion ratio		1			1
LogMeIn shares received in disposal of GetGo. | shares		26,900,000			26,900,000
Logmein shares received in disposal as percent of Company shares (percent)		0.171844291			0.171844291
Fractional shares of LogMeIn received | shares		0			0
Convertible debt, conversion ratio	13.9061
Convertible debt, conversion price (in dollars per share) | $ / shares	$ 71.91
Unidesk Corporation [Member] | Subsequent Event
Subsequent Event [Line Items]
Total consideration in business acquisitions			$ 60,500
Cash acquired from the acquisition			2,700
Acquisition transaction costs			$ 300
General and administrative | Unidesk Corporation [Member]
Subsequent Event [Line Items]
Acquisition related costs						$ 300
Scenario, Forecast | Proposed Spin-off Transaction
Subsequent Event [Line Items]
Charge to income tax expense					$ 45,200