Organization, Basis of Presentation and New Accounting Standards - Narrative (Details)	May 24, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares
Subsidiary, Sale of Stock [Line Items]
Remaining performance obligations | $		$ 0
Future minimum lease payments | $		$ 17,654,000
Class B common stock
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Class A common stock
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Class A common stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares sold | shares	43,700,000
Price per share (in dollars per share) | $ / shares	$ 23.00
Net proceeds, after deducting underwriting discounts and commissions | $	$ 954,800,000
GS Holdings | Class A common stock | Sale Of Stock To Parent Company [Member]
Subsidiary, Sale of Stock [Line Items]
Number Of Shares Purchased By Company | shares	2,426,198
GS Holdings | Newly-issued common units | Sale Of Stock To Parent Company [Member]
Subsidiary, Sale of Stock [Line Items]
Number Of Shares Purchased By Company | shares	41,273,802
Exchange of Holdco Units for Class A common stock pursuant to the Exchange Agreement
Subsidiary, Sale of Stock [Line Items]
Exchange ratio	1
GS Holdings
Subsidiary, Sale of Stock [Line Items]
Economic interest (as a percent)		31.30%