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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 |  |

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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 The minimum number of awards to be issued if minimum performance targets are not achieved. + References No definition available. + Details
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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. + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + 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=109223946&loc=d3e3602-108585 + Details
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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. + 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=109223946&loc=d3e3602-108585 + Details
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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. + 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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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