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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 18, 2014 | Feb. 01, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Repurchased During Period, Value | $ 60 | $ 100 | $ 60 |
Common Stock, Shares Authorized |  |  | 200,000,000 | 200,000,000
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01 | $ 0.01
Business Acquisition Stockholders Rights Plan Exercise Description |  |  | The rights would be exercisable only if a person or a group acquired or announced a tender or exchange offer to acquire 20% or more of our common stock or if we entered into other business combination transactions not approved by our board of directors. |
Unclassified Preferred Stock |  |  |  |
Preferred Stock, Shares Authorized |  |  | 25,000,000 |
Series D Junior Participating Preferred Stock |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 120 |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: 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=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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