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Stockholders' Equity - Additional Information 2 (Detail) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Period in the beginning of each year to award Performance Share Unit | 90 days |
PSU awards performance period | 3 years |
PSU awards performance period beginning date | Jan. 01, 2015 |
PSU awards performance period Ending date | Dec. 31, 2017 |
Target level for the determination of performance goals and measures | 100.00% |
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level | 65,796 |
Performance Share Units "PSU" Awards [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Dividends accrued in other current liabilities | $ 1 | $ 2
2015 Three-year PSU Awards [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Targeted number of common stock shares to be earned under the performance incentive plan | 224,760 |
Per share price of common stock | $ 46.05 |
Valuation per share | $ 59.91 |
Target level for the determination of performance goals and measures | 100.00% |
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level | 158,964 |
2015 Three-year PSU Awards [Member] | Minimum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares to be issued as a percentage of target shares under the performance incentive plan | 0.00% |
2015 Three-year PSU Awards [Member] | Maximum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares to be issued as a percentage of target shares under the performance incentive plan | 200.00% |

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 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 210.5-02.20) -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 -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 + Details
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