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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |
Maximum shares authorized for repurchase, prior and new announcements and total after new announcement | 50,000,000 |
Stock repurchased, shares | 600,000 |
Shares repurchased, average price per share | $ 16.18 |
Additional shares authorized for purchase | 2,900,000 |
Number of Options, exercised | 24,000 |
Exercise price of stock options, lower range limit | $ 15.29 |
Exercise price of stock options, upper range limit | $ 18.97 |
Proceeds from stock option exercises | $ 369 | $ 1,377

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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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