Shareholders' Equity - Schedule of Issued Shares of Class A common stock Under 2019 Long-Term Incentive Plan and 2009 Long-Term Incentive Plan (Detail) - 2019 Long-Term Incentive Plan and 2009 Long-Term Incentive Plan [Member] - Class A Common Stock [Member] - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Independent Directors for Vesting of Restricted Stock Units Compensation Plan [Member]
Schedule Of Employee Incentive Compensation Plans Disclosures [Line Items]
Shares issued to independent directors for vesting of restricted stock units issued for services rendered, in lieu of cash compensation	19,184	18,720
Stock Options, Vesting of Restricted Stock Units and Employee Stock Purchase Program [Member]
Schedule Of Employee Incentive Compensation Plans Disclosures [Line Items]
Shares issued to employees upon exercise of stock options, vesting of restricted stock units, and employee stock purchase program	116,393	354,113