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Stockholders' Equity - Additional Information 1 (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2017
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, 2016 |  |  |  |  |
PSU awards performance period ending date | Dec. 31, 2018 |  |  |  |  |
Liability for SARs |  | $ 2,000,000 |  | $ 2,000,000 |  |
Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock appreciation rights income (expense) |  | $ 1,000,000 | $ (2,000,000) | (1,000,000) | $ (5,000,000) |
Payment due to exercise SARs |  |  |  | $ 2,000,000 | $ 18,000,000 |
Time - Vesting Inducement Award [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Inducement award granted |  |  |  | 75,000 |  |
Grant date fair value |  |  |  | $ 39.95 |  |
Inducement award service expiration date |  |  |  | Dec. 31, 2017 |  |
Performance - Vesting Inducement Award [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Inducement award granted |  |  |  | 75,000 |  |
Grant date fair value |  |  |  | $ 12.55 |  |
Target level for the determination of performance goals and measures |  | 100.00% |  | 100.00% |  |
Performance Period |  |  |  | 2 years |  |
Performance - Vesting Inducement Award [Member] | Scenario, Forecast [Member] | Tranche One [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Cumulative total stockholder return |  |  |  |  |  | 25.00%
Performance - Vesting Inducement Award [Member] | Minimum [Member] | Scenario, Forecast [Member] | Tranche One [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock Price |  |  |  |  |  | $ 43.70
Performance - Vesting Inducement Award [Member] | Minimum [Member] | Scenario, Forecast [Member] | Tranche Two [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock Price |  |  |  |  |  | $ 55
Three-year PSU Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Performance Period |  |  |  | 3 years |  |
2016 Three-year PSU Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Target level for the determination of performance goals and measures for adjusted EBITDA goal | 50.00% |  |  |  |  |
Weighted average return on total shareholders | 50.00% |  |  |  |  |
2016 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% |  |  |  |  |
2016 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% |  |  |  |  |
2013 Three-year PSU Awards [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% |  |  |  |  |
Shares to be issued under performance incentive plan | 1,074,017 |  |  |  |  |

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