CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 233,352	$ 246,168	$ 573,298	$ 412,238
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax: 2016 - $2,306 and ($810); 2015 - ($225) and $1,595	(122,814)	29,636	(81,231)	2,416
Pension Plan and SERP liability adjustments, net of tax: 2016 - ($380) and ($760); 2015 - ($444) and ($952)	666	728	1,332	1,392
Comprehensive income	111,204	276,532	493,399	416,046
Less: comprehensive income attributable to non-controlling interests	(48,181)	(52,476)	(97,995)	(94,218)
Comprehensive income attributable to SNI	$ 63,023	$ 224,056	$ 395,404	$ 321,828