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Earnings Per Share - (Additional Information) (Detail) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 22, 2019	Sep. 23, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jul. 31, 2019	Jul. 19, 2019	Jul. 16, 2019
Stock options, outstanding			768,904	985,266	768,904	985,266	957,559
Stock options, weighted average exercise price			$ 38.87	$ 30.16	$ 38.87	$ 30.16	$ 30.81
Common stock excluded from calculation of diluted earnings per share			11,578	119,026	12,328	180,160
Common Stock [Member]
Conversion of Convertible Securities Stock Issued			2,316,200
2.125% Convertible Senior Notes due 2021
Aggregate principal amount			$ 115,000,000.0		$ 115,000,000.0					$ 92,000,000.0
2.125% Convertible Senior Notes due 2021 | Common Stock [Member]
Conversion of Convertible Securities Stock Issued	1,850,155	466,045
0.375% Convertible Senior Notes due 2024
Aggregate principal amount								$ 287,500,000	$ 287,500,000
Restricted Stock Units and Performance Stock Units
Restricted stock units, outstanding			696,098	766,986	696,098	766,986	734,984

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