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Stockholders' Equity - Additional Information 2 (Detail) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 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 | $ 2 | $ 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 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 Percentage Of Target Shares Under 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 Percentage Of Target Shares Under Performance Incentive Plan | 200.00% |

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