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Stock-Based Compensation - Schedule of Compensation Cost Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	$ 106,956	$ 88,838	$ 70,196
Less: Reimbursed costs and capitalized cost	(2,118)	(3,487)	(1,710)
Compensation cost after reimbursed costs and capitalized cost	104,838	85,351	68,486
Less: Related tax benefit	(20,605)	(16,752)	(13,218)
Compensation cost, net of tax benefit	84,233	68,599	55,268
Omnibus Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	93,096	76,995	57,735
MGP Omnibus Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	2,854	2,277	2,092
MGM China Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	$ 11,006	$ 9,566	$ 10,369

X

- Definition

Represents the gross compensation cost recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees, before reimbursed costs, if any, and capitalized amount.

+ References

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- Definition

Represents the net compensation cost recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees, after reimbursed costs, if any, and capitalized amount.

+ References

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- Definition

Share based compensation arrangement by share based payment award compensation cost reimbursed and capitalized.

+ References

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- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

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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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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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