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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,601,000		1,634,000
Stock option awards granted	0
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	99,375
Aggregate fair value of stock option vested	$ 5.6
Weighted average grant date fair value of stock option awards		$ 54.85
Stock option awards granted	0
Share-based compensation expense recognized	$ 3.2	$ 3.0
Unrecognized share-based compensation expense	$ 32.7
Unrecognized compensation expense expected to be recognized	3 years
2013 Equity Plan \| Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense expected to be recognized	2 years 2 months 12 days
Other stock-based awards granted	0
Unrecognized share-based compensation expense	$ 0.2
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,600,533
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	391,850