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Stock Repurchase Program and Dividends - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2018	May 05, 2019	Apr. 29, 2018	Mar. 31, 2019	Feb. 03, 2019
Stock Repurchase Program and Dividend [Line Items]
Common stock repurchased, shares		593,096	731,930
Common stock repurchased, average cost per share		$ 57.07	$ 51.53
Common stock repurchased, total cost		$ 33,848,000	$ 37,713,000
Stock repurchase program, remaining authorized repurchase amount		689,967,000	481,406,000
Stock repurchase program, authorized shares				$ 500,000,000
Treasure stock, value		$ 974,000	$ 303,000		$ 235,000
Percentage increase in authorized cash dividend	11.60%
Cash dividend, per common share		$ 0.43	$ 0.43
Authorized cash dividend, per common share	$ 0.48	$ 0.48
Dividend Declared [Member]
Stock Repurchase Program and Dividend [Line Items]
Dividend for common share				$ 0.05

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Aggregate dividends paid during the period for each share of common stock outstanding.

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