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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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