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Common and Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |  |  |
Increase in share repurchase authorized amount | $ 300,000 |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 82,000 | 628,000 |
Repurchase of common stock, including subsequent settlements |  |  |  | $ 7,600 | $ 45,800 |
Purchase of common stock |  |  | $ 1,200 | 7,005 | $ 46,864 |
Remaining authorized repurchase amount |  |  |  | $ 572,400 |  |
Common stock, authorized (in shares) |  |  |  | 150,000,000 |  | 150,000,000
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01
Preferred stock, authorized (in shares) |  |  |  | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 |  | $ 0.01
Preferred stock, issued (in shares) |  |  |  | 0 |  | 0
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Purchase of common stock |  | $ 600 |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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