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Share Repurchase Programs (Detail) - USD ($) | 5 Months Ended | 6 Months Ended | 41 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Aug. 31, 2017 | Aug. 31, 2014
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 50,000,000
Purchase of common stock, shares |  |  | 1,316,587,000 |  |
Purchase of Treasury Stock |  | $ 49,875,000 | $ 19,000,000 |  |
Offering and Sale of Notes |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 50,000,000 |
Purchase of common stock, shares | 1,414,900,000 |  |  |  |
Purchase of Treasury Stock | $ 49,900,000 |  |  |  |
Program |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Purchase of common stock, shares |  | 0 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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