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Stockholders' Equity - Additional Information (Detail) - USD ($)	Apr. 25, 2018	Mar. 31, 2018	Sep. 06, 2013
2013 program
Class Of Stock [Line Items]
Remaining amount approved for repurchases under stock buyback program		$ 170,000,000
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	Apr. 25, 2018
Dividend per share, declared	$ 0.04
Dividend payment date	Jun. 21, 2018
Dividend record date	Jun. 07, 2018

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of stock repurchase plan authorized.

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