Capital Structure - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 vote class shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Number of classes of common stock | class	4,000,000
Non-voting common interest units outstanding (in shares) | shares	7,919,952	8,760,755
Number of non-voting common interest units forfeited or repurchased (in shares) | shares	840,803	3,540,312	1,930,468
Class A common stock and Class C common stock
Class of Stock [Line Items]
Number of votes | vote	1
Class B common stock and Class D common stock
Class of Stock [Line Items]
Number of votes | vote	10