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Stock-based Compensation and Outstanding Awards (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Significant Assumptions Used to Calculate the Grant Date Fair Market Values of Options Granted | For the stock options granted in 2014 and 2013, the fair value of each option award was estimated on the date of grant using the Black-Scholes framework that uses the assumptions noted in the table below.
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Valuation Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 41.2 | % |  |  | 50.0 | % |  |  | 50.1 | %
Risk-free interest rate |  |  | 1.4 | % |  |  | 0.9 | % |  |  | 0.9 | %
Expected dividends (per share) |  | $ | — |  |  | $ | 0.75 |  |  | $ | 0.75 |
Expected term (in years) |  |  | 4.5 |  |  |  | 3.4 |  |  |  | 3.4 |
Summary of Stock Option Activity | A summary of stock option activity under the Plan as of December 31, 2015, and changes from December 31, 2014 through December 31, 2015 are presented below:
Stock Options(1) |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Grant-Date Fair Value |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding as of December 31, 2014 |  |  | 3,530,635 |  |  | $ | 30.86 |  |  |  |  |  |  |  |  |
Granted |  |  | 534,929 |  |  |  | 22.44 |  |  | $ | 8.06 |  |  |  |  |
Forfeited |  |  | (60,586 | ) |  |  | 29.51 |  |  |  |  |  |  |  |  |
Exercised or settled |  |  | (15,077 | ) |  |  | 13.98 |  |  |  |  |  |  |  |  |
Expired or canceled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2015 |  |  | 3,989,901 |  |  | $ | 29.81 |  |  | $ | — |  |  | $ | — |
Exercisable at December 31, 2015 |  |  | 2,437,226 |  |  | $ | 31.04 |  |  | $ | — |  |  | $ | — |
| (1) | All stock option awards presented in this table are for NOW stock only.
Summary of Status of Nonvested Shares of RSAs and RSUs | A summary of the status of the Company’s nonvested shares of RSAs and RSUs as of December 31, 2015, and changes for the period from December 31, 2014 through December 31, 2015 are presented below:
RSAs / RSUs(1) |  | Shares |  |  | Weighted- Average Grant-Date Fair Value |
Nonvested as of December 31, 2014 |  |  | 2,443,126 |  |  | $ | 30.24 |
Granted |  |  | 157,538 |  |  |  | 22.59 |
Vested(2) |  |  | (199,813 | ) |  |  | 35.20 |
Forfeited |  |  | (16,400 | ) |  |  | 31.09 |
Expired or canceled |  |  | — |  |  |  | — |
Nonvested as of December 31, 2015 |  |  | 2,384,451 |  |  | $ | 29.31 |
| (1) | All RSUs and RSAs presented in this table are for NOW stock only.
| (2) | 63,209 shares withheld and retired from the vesting of shares to employees to satisfy minimum tax withholding.
A summary of the status of the Company’s nonvested shares of PSAs as of December 31, 2015, and changes for the period from December 31, 2014 through December 31, 2015 are presented below:
PSAs |  | Shares |  |  | Weighted- Average Grant-Date Fair Value |
Nonvested as of December 31, 2014 |  |  | — |  |  | $ | — |
Granted |  |  | 73,243 |  |  |  | 24.34 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Expired or canceled |  |  | — |  |  |  | — |
Nonvested as of December 31, 2015 |  |  | 73,243 |  |  | $ | 24.34 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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