Shareholders' Equity - Additional Information (Detail)		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 30, 2017	Feb. 28, 2018 USD ($) shares	Dec. 31, 2019 USD ($) Vote $ / shares shares	Apr. 01, 2018 USD ($) shares	Dec. 31, 2017	Sep. 29, 2019 $ / shares	Sep. 30, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) Vote $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Apr. 25, 2018 shares	Feb. 01, 2018 USD ($)	Oct. 31, 2017 $ / shares	Apr. 12, 2017 USD ($)	Apr. 28, 2016 shares	Apr. 27, 2016 shares
Class of Stock [Line Items]
Authorized shares | shares			400,000					400,000	400,000
Preferred stock par value (in dollars per share) | $ / shares			$ 0.01					$ 0.01	$ 0.01
Common stock, shares authorized | shares			300,000,000					300,000,000	300,000,000		300,000,000				10,000,000	200,000,000
Stock split	2				2
Common stock par value, in dollars per share | $ / shares			$ 0.002					$ 0.002	$ 0.002				$ 0.002
Vote entitled for each common share outstanding | Vote			1					1
Repurchase of common stock								$ 61,690,000	$ 203,822,000	$ 123,715,000
Cash dividend declared per common share | $ / shares			$ 0.055			$ 0.050	$ 0.045
Payments of dividends								$ 35,124,000	$ 31,865,000
Repurchase Program 2014 [Member]
Class of Stock [Line Items]
total shares repurchased | shares				1,744,000
Repurchase of common stock, shares | shares				803,000
Repurchase of common stock				$ 45,200,000
Repurchase Program 2015 [Member]
Class of Stock [Line Items]
Repurchase of authorized common stock														$ 100,000,000
Repurchase of common stock, shares | shares		3,174,000						1,601,000
Repurchase of common stock		$ 150,000,000						$ 70,312,000
Repurchase Program November 2015 [Member]
Class of Stock [Line Items]
Repurchase of authorized common stock							$ 200,000,000					$ 150,000,000
Repurchase Program October 2018 [Member]
Class of Stock [Line Items]
Repurchase of authorized common stock			$ 129,688,000					$ 129,688,000
Repurchase of common stock, shares | shares								1,398,000	203,000
Repurchase of common stock								$ 61,690,000	$ 8,622,000
Common Stock [Member] | Repurchase Program 2014 [Member]
Class of Stock [Line Items]
Repurchased shares, total cost				$ 100,000,000