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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,487,000		1,487,000		1,481,000
Stock option awards granted	67,000
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	1,250
Aggregate fair value of stock option vested	$ 0.1
Weighted average grant date fair value of stock option awards	$ 48.20
Share-based compensation expense recognized	$ 2.4	$ 1.8	$ 7.8	$ 7.8
Unrecognized share-based compensation expense	$ 24.7		$ 24.7
Unrecognized compensation expense expected to be recognized			2 years 8 months 12 days
Stock option awards granted		0
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			1 year 8 months 12 days
Other stock-based awards granted	0
Unrecognized share-based compensation expense	$ 0.2		$ 0.2
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,487,408		1,487,408
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		2,300,000
Shares of class A common stock reserved and available for future issuance	479,638		479,638