Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments in and Advances to Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 1,252,432	$ 1,220,443
CityCenter Holdings LLC As Investee [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	1,038,606	1,007,358
Elgin Riverboat Resort-Riverboat Casino [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	122,984	123,585
Las Vegas Arena Company LLC As Investee [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	78,198	80,339
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 12,644	$ 9,161