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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 |

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- Definition Minimum adjustment factor allowed under the form of performance share award agreement. + References No definition available. + Details
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- Definition Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement. + References 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) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References 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 (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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