CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 163,333	$ 170,301	$ 575,571	$ 548,759
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax	(6,728)	(18,311)	(4,312)	(13,168)
Pension liability adjustment, net of tax	750	518	2,142	1,467
Comprehensive income	157,355	152,508	573,401	537,058
Less: comprehensive income attributable to non-controlling interests	(41,904)	(38,867)	(136,122)	(135,168)
Comprehensive income attributable to SNI	$ 115,451	$ 113,641	$ 437,279	$ 401,890