Stockholders' Equity - Additional Information (Detail) - USD ($)	Oct. 21, 2020	Jul. 22, 2020	Apr. 22, 2020	Sep. 30, 2020	Dec. 31, 2019	Jul. 24, 2019	Feb. 06, 2019	Jul. 25, 2018	Sep. 06, 2013
Class Of Stock [Line Items]
Preferred stock, par value				$ 0.01	$ 0.01
Percentage of beneficial ownership required to exercise the right under Rights agreement, Description			10% (12% for passive investors) or more
Percentage of discount on purchase of additional share in Right agreement			50.00%
Percentage of acquisition in merger or other unapproved party description			more than 10% (12% for passive investors)
Percentage of discount on share acquisition in merger or other unapproved party			50.00%
Percentage of beneficial ownership not exercisable prior to adoption of Right agreement, Description			10% (12% for passive investors) or more
Redemption price of rights			$ 0.001
Rights agreement outstanding common stock acquisition percentage description		20% or more
Rights agreement common stock holding percentage description		4.9% or more
Expire period of Right agreement			Apr. 21, 2021
2013 program
Class Of Stock [Line Items]
Increase of the authorization under the stock buyback program						$ 250,000,000	$ 250,000,000	$ 250,000,000
Remaining amount approved for repurchases under stock buyback program				$ 130,000,000
2013 program | Maximum
Class Of Stock [Line Items]
Amount approved for repurchases under stock buyback program									$ 200,000,000
Subsequent Event | Dividend Declared
Class Of Stock [Line Items]
Dividend declaration date	Oct. 21, 2020
Dividend per share, declared	$ 0.02
Dividend payment date	Dec. 17, 2020
Dividend record date	Dec. 03, 2020
Series A Junior Participating Preferred Stock
Class Of Stock [Line Items]
Preferred stock, par value			$ 0.01
Preferred stock, exercise price per right			$ 17.00