The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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No definition available.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	5,575,000
Outstanding Options, Weighted-Average Remaining Life (Years)	6 years 8 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 10.02	$ 10.77	$ 15.54	$ 22.96
Number of Exercisable Options (in shares)	3,490,000
Exercisable Options, Weighted-Average Remaining Life (Years)	5 years 10 months 24 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 13.17	18.25	$ 21.35
Range Of Exercise Prices [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	2,590,000
Outstanding Options, Weighted-Average Remaining Life (Years)	8 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 3.98
Number of Exercisable Options (in shares)	845,000
Exercisable Options, Weighted-Average Remaining Life (Years)	8 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 3.98
Range of Exercise Prices, lower limit (USD per share)	$ 0.00
Range of Exercise Prices, upper limit (USD per share)		4.99
Range Of Exercise Prices One [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	1,699,000
Outstanding Options, Weighted-Average Remaining Life (Years)	6 years 4 months 24 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 8.98
Number of Exercisable Options (in shares)	1,359,000
Exercisable Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 9.05
Range of Exercise Prices, lower limit (USD per share)	$ 5.00
Range of Exercise Prices, upper limit (USD per share)		9.99
Range Of Exercise Prices Two [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	595,000
Outstanding Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 10.18
Number of Exercisable Options (in shares)	595,000
Exercisable Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 10.18
Range of Exercise Prices, lower limit (USD per share)	$ 10.00
Range of Exercise Prices, upper limit (USD per share)		19.99
Range Of Exercise Prices Three [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	691,000
Outstanding Options, Weighted-Average Remaining Life (Years)	2 years 3 months 18 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 35.09
Number of Exercisable Options (in shares)	691,000
Exercisable Options, Weighted-Average Remaining Life (Years)	2 years 3 months 18 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 35.09
Range of Exercise Prices, lower limit (USD per share)	$ 20.00
Range of Exercise Prices, upper limit (USD per share)		$ 59.99