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Share-based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Options outstanding, shares	1,157,000	1,634,000	1,480,000	992,000
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense expected to be recognized	3 years 10 months 24 days
Restricted stock units outstanding	74,000	0
Vested	0
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 192.43
Unrecognized share-based compensation expense	$ 13,800,000
Granted	76,000
2013 Equity Plan | Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	200,000	216,250	251,250
Aggregate fair value of stock option vested	$ 11,200,000	$ 12,600,000	$ 15,500,000
Weighted average grant date fair value of stock option awards	$ 49.68	$ 54.36	$ 51.68
Share-based compensation expense recognized	$ 10,100,000	$ 10,100,000	$ 14,600,000
Unrecognized share-based compensation expense	$ 21,800,000
Unrecognized compensation expense expected to be recognized	2 years 7 months 6 days
2013 Equity Plan | RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Share-based compensation expense recognized	$ 500,000
Restricted stock units outstanding	74,400
2013 Equity Plan | Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 600,000	$ 0	$ 0
Unrecognized compensation expense expected to be recognized	1 year 4 months 24 days
Unrecognized share-based compensation expense	$ 1,000,000.0
2013 Equity Plan | Class A | Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,157,375
2013 Equity Plan | Class A | Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	0	0
2013 Equity Plan | Class A | Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award expiration period	10 years
Vesting period	4 years
2013 Equity Plan | Class A | Employees, Officers, and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	2,300,000
Shares of class A common stock reserved and available for future issuance	415,238

X

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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