Summary of Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
Dec. 31, 2018 $ / shares shares
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding \| shares	142,074
Remaining contract life in years, Outstanding options	4 years 7 months 20 days
Number outstanding, Weighted average exercise price	$ 63.43
Number exercisable \| shares	142,074
Remaining contract life in years, Excercisable options	4 years 7 months 20 days
Number excercisable, Weighted average exercise price	$ 63.43
$11.57
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 11.57
Number outstanding \| shares	5,885
Remaining contract life in years, Outstanding options	1 month 20 days
Number outstanding, Weighted average exercise price	$ 11.57
Number exercisable \| shares	5,885
Remaining contract life in years, Excercisable options	1 month 20 days
Number excercisable, Weighted average exercise price	$ 11.57
$31.71
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 31.71
Number outstanding \| shares	7,047
Remaining contract life in years, Outstanding options	1 year 1 month 17 days
Number outstanding, Weighted average exercise price	$ 31.71
Number exercisable \| shares	7,047
Remaining contract life in years, Excercisable options	1 year 1 month 17 days
Number excercisable, Weighted average exercise price	$ 31.71
$47.52– $49.07
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range, lower range Limit	47.52
Shares authorized under stock option plans, exercise price range, upper range limit	$ 49.07
Number outstanding \| shares	27,553
Remaining contract life in years, Outstanding options	3 years 7 months 20 days
Number outstanding, Weighted average exercise price	$ 48.30
Number exercisable \| shares	27,553
Remaining contract life in years, Excercisable options	3 years 7 months 20 days
Number excercisable, Weighted average exercise price	$ 48.30
$51.74
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 51.74
Number outstanding \| shares	10,120
Remaining contract life in years, Outstanding options	2 years 1 month 24 days
Number outstanding, Weighted average exercise price	$ 51.74
Number exercisable \| shares	10,120
Remaining contract life in years, Excercisable options	2 years 1 month 24 days
Number excercisable, Weighted average exercise price	$ 51.74
$67.29
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 67.29
Number outstanding \| shares	37,768
Remaining contract life in years, Outstanding options	5 years 1 month 20 days
Number outstanding, Weighted average exercise price	$ 67.29
Number exercisable \| shares	37,768
Remaining contract life in years, Excercisable options	5 years 1 month 20 days
Number excercisable, Weighted average exercise price	$ 67.29
$80.40
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 80.40
Number outstanding \| shares	53,701
Remaining contract life in years, Outstanding options	6 years 1 month 17 days
Number outstanding, Weighted average exercise price	$ 80.40
Number exercisable \| shares	53,701
Remaining contract life in years, Excercisable options	6 years 1 month 17 days
Number excercisable, Weighted average exercise price	$ 80.40

Share based compensation shares authorized under stock option plans exercise price.

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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 exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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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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