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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,481,000		1,481,000		1,601,000
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	23,750
Aggregate fair value of stock option vested	$ 1.4
Weighted average grant date fair value of stock option awards	$ 42.50	$ 48.84
Share-based compensation expense recognized	$ 2.2	$ 3.0	$ 5.4	$ 6.0
Unrecognized share-based compensation expense	$ 25.8		$ 25.8
Unrecognized compensation expense expected to be recognized			2 years 9 months 18 days
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 10 months 24 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	1,480,533		1,480,533
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		2,300,000
Shares of class A common stock reserved and available for future issuance	499,638		499,638