Maximum Adjustment Factor allowed under the form of performance share award agreement.

No definition available.

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- Definition

Minimum Adjustment Factor allowed under the form of performance share award agreement.

+ References

No definition available.

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- Definition

The minimum number of awards to be issued if minimum performance targets are not achieved.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Number of Common Shares Awarded Upon Settlement.

+ References

No definition available.

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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.

+ References

No definition available.

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- Definition

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

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Share-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($) shares	Dec. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock issued during period, shares, employee stock purchase plans	0	0	0	0
Stock compensation expense \| $	$ 23,824	$ 18,002	$ 37,206	$ 29,269
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period	462,000	461,000
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period. Weighted average fair value \| $ / shares	$ 75.73	$ 69.58
Number of common stock issued per unit based award upon vesting	1	1
Restricted Stock Units (RSUs) \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	3 years	3 years
Directors Restricted Stock Plan 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period	24,000	25,000
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period	96,000	18,000
Number of common stock issued per unit based award upon vesting	1	1
Maximum adjustment factor	2	2
Minimum adjustment factor	0.5	0.5
Minimum shares issued	0	0
Retirement Eligible Restricted Stock Unit (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock or unit expense \| $	$ 5,000	$ 4,000	5,000	$ 4,000
Retirement Eligible Performance Stock Unit (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period					0
Stock compensation expense \| $	$ 5,000		$ 5,000