Condensed Consolidated Statement of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Stockholders Equity [Abstract]
Class A common stock dividends	$ 0.47	$ 0.47	$ 0.94	$ 0.94
Tax expense (benefit) related to delivery of Class A Common Stock in connection with share-based incentive compensation	$ 55	$ (636)	$ 1,144	$ (983)

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration