Stock Based Compensation - Additional Information (Details) - USD ($) shares in Thousands, $ in Millions |
1 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jan. 31, 2016 |
Sep. 30, 2016 |
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| Stock Options | 2007 Omnibus Equity Compensation Plan | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Maximum terms | 7 years | |||
| Vesting period | 3 years | |||
| Unrecognized compensation cost | $ 2 | |||
| Weighted-average period (in years) | 1 year 8 months 12 days | |||
| Stock Options | 2007 Omnibus Equity Compensation Plan | Minimum | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Vesting period | 1 year | |||
| Stock Options | 2007 Omnibus Equity Compensation Plan | Maximum | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Vesting period | 3 years | |||
| Restricted Stock Units | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Vesting period | 3 years | |||
| Unrecognized compensation cost | $ 5 | |||
| Weighted-average period (in years) | 1 year 1 month 6 days | |||
| Number of vested | [1] | 251 | ||
| Number of grants | 143 | |||
| 2013 RSUs | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Number of vested | 128 | 202 | ||
| Number of grants | 74 | |||
| Restricted shares granted | The terms of the 2013 RSUs specified that, so long as the participant continued to be employed by the Company during the Performance Period and to the extent the performance conditions were achieved, the RSUs would vest at target; if the performance conditions were surpassed, up to 175% of the target number of shares would be distributed; and to the extent that the performance thresholds were not met, the award would be forfeited. | |||
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