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Stockholders' Equity - Additional Information (Detail) - USD ($)	Jul. 25, 2018	Jun. 30, 2018	Sep. 06, 2013
2013 program
Class Of Stock [Line Items]
Remaining amount approved for repurchases under stock buyback program		$ 136,000,000
2013 program | Maximum
Class Of Stock [Line Items]
Amount approved for repurchases under stock buyback program			$ 200,000,000
Subsequent Event | 2013 program
Class Of Stock [Line Items]
Amount approved for repurchases under stock buyback program	$ 250,000,000
Subsequent Event | Dividend Declared
Class Of Stock [Line Items]
Dividend declaration date	Jul. 25, 2018
Dividend per share, declared	$ 0.04
Dividend payment date	Sep. 20, 2018
Dividend record date	Sep. 06, 2018

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