Maximum adjustment factor allowed under the form of performance share award agreement.

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Minimum adjustment factor allowed under the form of performance share award agreement.

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- Definition

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

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

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	$ 12,155	$ 13,902	$ 49,361	$ 43,171
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			$ 75.73	$ 69.58
Number of common stock issued per unit based award upon vesting			100.00%	100.00%
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			100.00%	100.00%
Maximum adjustment factor			200.00%	200.00%
Minimum adjustment factor			50.00%	50.00%
Minimum shares issued			0	0
Employee Stock
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. Weighted average fair value			$ 17.03	$ 17.49
Stock issued during period, shares, employee stock purchase plans	585,000	666,000	585,000	666,000
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
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