Acquisitions - Pro forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Pro Forma Revenues:	$ 776,122	$ 748,817	$ 2,384,591	$ 2,358,337
Pro forma net income attributable to SNI	$ 124,559	$ 109,047	$ 419,920	$ 380,917
Pro forma net income attributable to SNI per basic common share	$ 0.96	$ 0.77	$ 3.23	$ 2.67
Pro forma net income attributable to SNI per diluted common share	$ 0.96	$ 0.77	$ 3.22	$ 2.65
Weighted average basic shares outstanding	129,177	140,738	129,817	142,786
Weighted average diluted shares outstanding	129,704	141,628	130,434	143,703

Business acquisition pro forma weighted average shares outstanding basic.

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- Definition

Business acquisition pro forma weighted average shares outstanding diluted.

+ References

No definition available.

+ Details

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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- References

No definition available.

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