Stockholders' Equity - Additional Information (Detail) - USD ($)	Feb. 08, 2017	Jan. 27, 2017	Dec. 31, 2016	Sep. 06, 2013
2013 program
Class Of Stock [Line Items]
Remaining amount approved for repurchases under stock buyback program			$ 187,000,000
2013 program | Maximum
Class Of Stock [Line Items]
Amount approved for repurchases under stock buyback program				$ 200,000,000
Subsequent Event | Common Stock
Class Of Stock [Line Items]
Common stock offering		18,200,000
Net proceeds from common stock offering		$ 470,000,000
Subsequent Event | Dividend Declared
Class Of Stock [Line Items]
Dividend declaration date	Feb. 08, 2017
Dividend per share, declared	$ 0.02
Dividend payment date	Mar. 22, 2017
Dividend record date	Mar. 08, 2017