CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Statement of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	$ 141,482	$ 209,658
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	(33,507)	(49,786)
Acquisition of businesses, net of cash acquired	(28,329)	(423,104)
Purchase of alarm monitoring contracts	(5,682)	(21,616)
Proceeds from sale of non-media business	192,639	0
Investments in equity and cost method investees	(20,690)	(21,843)
Loans to affiliates	0	(19,500)
Other, net	3,064	(7,399)
Net cash flows from (used in) investing activities	101,367	(528,450)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	163,089	607,555
Repayments of notes payable, commercial bank financing and capital leases	(301,168)	(279,575)
Proceeds from the sale of Class A Common Stock	487,883	0
Dividends paid on Class A and Class B Common Stock	(34,744)	(32,781)
Repurchase of outstanding Class A Common Stock	0	11,247
Distributions to noncontrolling interests	(18,048)	(4,170)
Increase (decrease) in intercompany payables	0	0
Other, net	(3,798)	(7,235)
Net cash flows from financing activities	293,214	272,547
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	536,063	(46,245)
CASH AND CASH EQUIVALENTS, beginning of period	259,984	149,972
CASH AND CASH EQUIVALENTS, end of period	796,047	103,727
Reportable legal entities \| Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	2,030	2,296
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	(117)	0
Acquisition of businesses, net of cash acquired	0	0
Purchase of alarm monitoring contracts	0	0
Proceeds from sale of non-media business	0
Investments in equity and cost method investees	(945)	0
Loans to affiliates		0
Other, net	(2,266)	(1,197)
Net cash flows from (used in) investing activities	1,204	1,197
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and capital leases	0	0
Proceeds from the sale of Class A Common Stock	487,883
Dividends paid on Class A and Class B Common Stock	(34,744)	(32,781)
Repurchase of outstanding Class A Common Stock		11,247
Distributions to noncontrolling interests	0	0
Increase (decrease) in intercompany payables	(453,712)	42,586
Other, net	(2,661)	(2,051)
Net cash flows from financing activities	(3,234)	(3,493)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0
CASH AND CASH EQUIVALENTS, end of period	0	0
Reportable legal entities \| Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	(91,863)	(81,821)
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	(3,913)	(1,871)
Acquisition of businesses, net of cash acquired	(8,308)	0
Purchase of alarm monitoring contracts	0	0
Proceeds from sale of non-media business	0
Investments in equity and cost method investees	(481)	(10,827)
Loans to affiliates		(19,500)
Other, net	8,189	(3,725)
Net cash flows from (used in) investing activities	(20,891)	(28,473)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	159,669	595,000
Repayments of notes payable, commercial bank financing and capital leases	(186,319)	(272,672)
Proceeds from the sale of Class A Common Stock	0
Dividends paid on Class A and Class B Common Stock	0	0
Repurchase of outstanding Class A Common Stock		0
Distributions to noncontrolling interests	0	0
Increase (decrease) in intercompany payables	662,973	(249,887)
Other, net	(25)	(5,681)
Net cash flows from financing activities	636,298	66,760
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	523,544	(43,534)
CASH AND CASH EQUIVALENTS, beginning of period	232,297	115,771
CASH AND CASH EQUIVALENTS, end of period	755,841	72,237
Reportable legal entities \| Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	232,678	282,530
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	(27,596)	(45,155)
Acquisition of businesses, net of cash acquired	(20,021)	(412,729)
Purchase of alarm monitoring contracts	0	0
Proceeds from sale of non-media business	0
Investments in equity and cost method investees	(15,046)	0
Loans to affiliates		0
Other, net	(830)	(58)
Net cash flows from (used in) investing activities	(61,833)	(457,826)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and capital leases	(731)	(719)
Proceeds from the sale of Class A Common Stock	0
Dividends paid on Class A and Class B Common Stock	0	0
Repurchase of outstanding Class A Common Stock		0
Distributions to noncontrolling interests	0	0
Increase (decrease) in intercompany payables	(165,240)	181,829
Other, net	707	750
Net cash flows from financing activities	(165,264)	181,860
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,581	6,564
CASH AND CASH EQUIVALENTS, beginning of period	10,675	235
CASH AND CASH EQUIVALENTS, end of period	16,256	6,799
Reportable legal entities \| Non- Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	(4,671)	(8,483)
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	(1,881)	(3,206)
Acquisition of businesses, net of cash acquired	0	(10,375)
Purchase of alarm monitoring contracts	(5,682)	(21,616)
Proceeds from sale of non-media business	192,639
Investments in equity and cost method investees	(4,218)	(11,016)
Loans to affiliates		0
Other, net	(2,029)	(2,419)
Net cash flows from (used in) investing activities	182,887	(43,794)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	3,420	12,555
Repayments of notes payable, commercial bank financing and capital leases	(114,118)	(6,184)
Proceeds from the sale of Class A Common Stock	0
Dividends paid on Class A and Class B Common Stock	0	0
Repurchase of outstanding Class A Common Stock		0
Distributions to noncontrolling interests	(18,048)	(4,170)
Increase (decrease) in intercompany payables	(40,563)	41,172
Other, net	(1,969)	(371)
Net cash flows from financing activities	(171,278)	43,002
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	6,938	(9,275)
CASH AND CASH EQUIVALENTS, beginning of period	17,012	33,966
CASH AND CASH EQUIVALENTS, end of period	23,950	24,691
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	3,308	15,136
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Acquisition of property and equipment	0	446
Acquisition of businesses, net of cash acquired	0	0
Purchase of alarm monitoring contracts	0	0
Proceeds from sale of non-media business	0
Investments in equity and cost method investees	0	0
Loans to affiliates		0
Other, net	0	0
Net cash flows from (used in) investing activities	0	446
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and capital leases	0	0
Proceeds from the sale of Class A Common Stock	0
Dividends paid on Class A and Class B Common Stock	0	0
Repurchase of outstanding Class A Common Stock		0
Distributions to noncontrolling interests	0	0
Increase (decrease) in intercompany payables	(3,458)	(15,700)
Other, net	150	118
Net cash flows from financing activities	(3,308)	(15,582)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0
CASH AND CASH EQUIVALENTS, end of period	$ 0	$ 0

Represents the increase (decrease) during the period in the amount of intercompany payables.

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This element represents the cash paid for securing alarm monitoring contracts.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash outflow to reacquire common stock during the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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