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Share-based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards granted	470,000	710,000	175,000
Options outstanding, shares	1,634,000	1,480,000	992,000	886,000
Expected dividend yield	0.00%	0.00%	0.00%
2013 Equity Plan | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	216,250	251,250	215,000
Aggregate fair value of stock option vested	$ 12,600,000	$ 15,500,000	$ 13,000,000.0
Weighted average grant date fair value of stock option awards	$ 54.36	$ 51.68	$ 68.67
Share-based compensation expense recognized	$ 10,100,000	$ 14,600,000	$ 14,300,000
Unrecognized share-based compensation expense	$ 36,400,000
Unrecognized compensation expense expected to be recognized	3 years 2 months 12 days
2013 Equity Plan | Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 0	$ 0
Unrecognized compensation expense expected to be recognized	2 years 4 months 24 days
Unrecognized share-based compensation expense	$ 300,000
2013 Equity Plan | Class A
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 | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards granted	470,000
Options outstanding, shares	1,634,358
2013 Equity Plan | Class A | Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other stock-based awards granted	0
2013 Equity Plan | Class A | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	2,300,000
2013 Equity Plan | Class A | Employees, Officers, and Directors | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of class A common stock reserved and available for future issuance	360,625

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

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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