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Share based Compensation Arrangement by Share based Payment Award, Maximum Contribution Per Employee

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Share based compensation arrangement by share based payment award maximum number of common shares issuable up on vesting.

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Share reserve to restricted stock units granted ratio.

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Term of offering period, employee stock purchase plan.

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Aggregate number of common shares reserved for future issuance.

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-Section S99
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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STOCK BASED COMPENSATION - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	May 31, 2017	Feb. 28, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance			9,295,973
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			1,299,999
Percentage of discount to market price			85.00%
Term of offering period			6 months
Maximum payroll deductions during the offering period, per employee			$ 5,000
Shares available for issuance (in shares)			390,835
Stock issued during period (in shares)			111,528	89,100	68,039
Amended and Restated ESPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized	300,000
Canadian Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			100,000
Percentage of discount to market price			95.00%
Term of offering period			6 months
Maximum payroll deductions during the offering period, per employee			$ 5,000
Shares available for issuance (in shares)			97,478
Stock issued during period (in shares)			1,766	756
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses related to stock options			$ 28,100,000
Weighted average period of recognition for unrecognized compensation expenses			2 years 7 months 20 days
Stock Options \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
Stock Options \| Officers And Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of an option granted under any plan			8 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of an option granted under any plan			10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition for unrecognized compensation expenses			3 years 6 months 18 days
Award granted			210,829
Unrecognized compensation expenses related to RSUs			$ 17,700,000
Fair value of units vested (in shares)			$ 2,900,000
Units vested (in shares)			37,225	0	0
Per share weighted average fair value of units granted			$ 82.93	$ 106.01	$ 114.27
Restricted Stock Units (RSUs) \| 2008, 2011, and 2014 Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of share reserve related to RSUs granted			200.00%
Restricted Stock Units (RSUs) \| 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of share reserve related to RSUs granted			100.00%
Restricted Stock Units (RSUs) \| 2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award granted			0
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of units vested (in shares)			$ 900,000
Per share weighted average fair value of units granted			$ 82.85
Maximum number of common shares issuable upon vesting			11,149
Percentage of performance goals			25.00%
Performance-Based Restricted Stock Units \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units vested (in shares)		2,787