Income Before Provision for Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	[1]	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[2]	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Income Before Provision for Taxes	$ 1,007,337	$ 1,010,949		$ 685,697	$ 1,114,032	$ (49,352)	$ 975,786	$ 1,689,708		$ 896,799	$ 3,818,015	$ 3,512,941	$ 4,118,089
Domestic Tax Authority
Income Taxes [Line Items]
Income Before Provision for Taxes											3,547,292	3,308,202	3,956,339
Foreign Tax Authority
Income Taxes [Line Items]
Income Before Provision for Taxes											$ 270,723	$ 204,739	$ 161,750

[1] As a result of the Conversion, there was a reduction of $174.6 million of the tax receivable agreement liability during the three months ended September 30, 2019. The reduction of the tax receivable agreement liability was included in Other Income.

[2] For the three months ended June 30, 2018, Revenues included $580.9 million of Transaction-Related Charges recorded in Other Revenues received upon the conclusion of Blackstone’s investment sub-advisory relationship with FS Investments’ funds.