Sirius XM Holdings Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 16, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2017
Accounting Policies [Abstract]
Actual credit losses											$ 3,555	$ 2,040	$ 1,138
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from adoption of ASU 2016-09		$ 0									0
Concentration Risk [Line Items]
Capitalized cost, net of amortization, related to internal use software and website development costs		7,400				$ 7,500					7,400	7,500
Impairment of goodwill		0	$ 0	$ 131,997	$ 0	0	$ 0	$ 0	$ 0		131,997	0	0
Content acquisition cost percent	20.00%
Prepaid content acquisition costs		55,668				46,310					55,668	46,310
Advertising expenses											$ 48,500	45,700	$ 35,100
RSUs
Concentration Risk [Line Items]
Service period over which company recognizes stock-based compensation (years)											2 years 10 days
PSUs
Concentration Risk [Line Items]
Service period over which company recognizes stock-based compensation (years)										4 years	4 years
Service period over which company recognizes stock-based compensation (years)											2 years 1 month 20 days
Internal use software and website development
Concentration Risk [Line Items]
Capitalized cost, net of amortization, related to internal use software and website development costs		50,900				$ 25,700					$ 50,900	$ 25,700
Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from adoption of ASU 2016-09		$ 1,154									$ 1,154
Minimum
Concentration Risk [Line Items]
Estimated useful lives of assets (years)											3 years
Finite-lived intangible asset, useful life (years)											3 years
Minimum \| RSUs
Concentration Risk [Line Items]
Service period over which company recognizes stock-based compensation (years)											3 years
Minimum \| Internal use software and website development
Concentration Risk [Line Items]
Estimated useful lives of assets (years)											3 years
Maximum
Concentration Risk [Line Items]
Estimated useful lives of assets (years)											5 years
Finite-lived intangible asset, useful life (years)											11 years
Maximum \| RSUs
Concentration Risk [Line Items]
Service period over which company recognizes stock-based compensation (years)											4 years
Maximum \| Internal use software and website development
Concentration Risk [Line Items]
Estimated useful lives of assets (years)											5 years
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset														$ 142,000
ASU 2016-09 \| Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from adoption of ASU 2016-09														$ 1,200