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Equity - Incentive Equity Awards - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 14, 2018 | Mar. 12, 2018 | Feb. 01, 2018 | Oct. 02, 2017 | May 15, 2017 | Feb. 01, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Stock options, outstanding |  |  |  |  |  |  | 21,036,913 | 21,036,913 |
Shares issued, exercise of stock options |  |  |  |  |  |  |  | 5,439,239 | 259,195
Proceeds from exercise of stock options, net of transaction costs |  |  |  |  |  |  |  | $ 16,494 | $ 451
Other receivable |  |  |  |  |  |  | $ 25,654 | $ 25,654 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units, outstanding |  |  |  |  |  |  | 9,634,188 | 9,634,188 |
Percentage of outstanding shares on a fully diluted basis |  |  |  |  |  |  | 3.00% | 3.00% |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Stock units, Granted | 190,034 |  | 1,305,575 |  | 91,504 | 1,575,000 |  |  |
Stock units, Vesting Period | 3 years |  | 3 years |  | 3 years | 3 years |  |  |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vesting Period |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Stock units, Granted |  | 970,000 |  | 220,000 | 2,310,000 |  |  |  |
Stock units, Vesting Period |  |  |  |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vest over a three year period |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, related to the vesting of RSUs |  |  |  |  |  |  |  | 506,679 |
Treasury shares for settlement of employee tax obligations |  |  |  |  |  |  |  | 183,828 |
Stock Options |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares on a fully diluted basis |  |  |  |  |  |  | 6.00% | 6.00% |
Other receivable |  |  |  |  |  |  | $ 23,200 | $ 23,200 |
Stock Options | Stock Incentive Plan 2011 |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Stock options, Granted | 286,536 |  | 2,205,075 |  | 131,575 | 2,642,500 |  |  |
Stock units, Vesting Period |  |  | 4 years |  |  | 4 years |  |  |
Performance-Based RSUs |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, related to the vesting of RSUs |  |  |  |  |  |  | 2,499,750 |  |
Treasury shares for settlement of employee tax obligations |  |  |  |  |  |  | 764,819 |  |

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