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Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0
Cash received from option exercises	$ 9,700,000	$ 41,600,000	$ 4,100,000
Tax benefit realized from stock options exercised	700,000	4,000,000.0	1,100,000
Intrinsic value of options exercised	13,200,000	26,400,000	900,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 100,000
Unrecognized compensation cost, recognition period (in years)	2 months 12 days
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 27,500,000
Unrecognized compensation cost, recognition period (in years)	4 years
Fair value, released	$ 18,600,000	10,400,000	9,900,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 800,000
Unrecognized compensation cost, recognition period (in years)	2 years 9 months 18 days
Fair value, released	$ 4,500,000	5,400,000	4,100,000
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 6,300,000
Unrecognized compensation cost, recognition period (in years)	1 year 1 month 6 days
Fair value, released	$ 5,800,000	$ 1,400,000	$ 0
Omnibus Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)	1,396,183
Minimum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Maximum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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