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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) - $ / shares | 12 Months Ended |  |  |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Number of Outstanding Options (in shares) | 3,754,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 6 years 8 months 12 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 15.54 | $ 22.96 | $ 29.16 | $ 36.84
Number of Exercisable Options (in shares) | 1,954,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 4 years 9 months 29 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 21.35 | $ 29.76 | $ 35.89 |
$5.00 – $9.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 5 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 9.99 |  |  |
Number of Outstanding Options (in shares) | 1,878,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 8 years 3 months 23 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 9.01 |  |  |
Number of Exercisable Options (in shares) | 554,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 7 years 2 months 12 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 9.44 |  |  |
$10.00 – $19.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 10.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 19.99 |  |  |
Number of Outstanding Options (in shares) | 871,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 6 years 8 months 24 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 10.48 |  |  |
Number of Exercisable Options (in shares) | 396,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 4 years 11 months 19 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 10.85 |  |  |
$20.00 – $24.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 20.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 24.99 |  |  |
Number of Outstanding Options (in shares) | 281,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 1 year 2 months 7 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 24.42 |  |  |
Number of Exercisable Options (in shares) | 281,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 1 year 2 months 9 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 24.42 |  |  |
$25.00 – $29.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 25.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 29.99 |  |  |
Number of Outstanding Options (in shares) | 350,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 3 years 2 months 5 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 27.69 |  |  |
Number of Exercisable Options (in shares) | 349,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 3 years 2 months 5 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 27.69 |  |  |
$30.00 – $34.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 30.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 34.99 |  |  |
Number of Outstanding Options (in shares) | 95,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 3 years 4 months 13 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 34.43 |  |  |
Number of Exercisable Options (in shares) | 95,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 3 years 4 months 13 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 34.42 |  |  |
$35.00 – $39.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 35.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | 39.99 |  |  |
$40.00 – $49.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 40.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 44.99 |  |  |
Number of Outstanding Options (in shares) | 264,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 6 years 2 months 9 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 43.99 |  |  |
Number of Exercisable Options (in shares) | 264,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 6 years 2 months 9 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 43.99 |  |  |
$50.00 – $59.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, lower limit (USD per share) | 50.00 |  |  |
Range of Exercise Prices, upper limit (USD per share) | $ 59.99 |  |  |
Number of Outstanding Options (in shares) | 15,000 |  |  |
Outstanding Options, Weighted-Average Remaining Life (Years) | 5 years 2 months 11 days |  |  |
Outstanding Options, Weighted-Average Exercise Price (dollars per share) | $ 56.76 |  |  |
Number of Exercisable Options (in shares) | 15,000 |  |  |
Exercisable Options, Weighted-Average Remaining Life (Years) | 5 years 2 months 12 days |  |  |
Exercisable Options, Weighted-Average Exercise Price (dollars per share) | $ 56.76 |  |  |

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- Definition 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. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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