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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail) | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Common Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Nonvested common stock awards, Beginning balance | shares | 173,189
Granted | shares | 10,800
Vested | shares | (564)
Forfeited/Cancelled | shares | (445)
Nonvested common stock awards, Ending balance | shares | 182,980
Nonvested performance-based stock awards, Beginning balance | $ / shares | $ 47.40
Granted | $ / shares | 45.65
Vested | $ / shares | 54.98
Forfeited/Cancelled | $ / shares | 56.05
Nonvested performance-based stock awards, Ending balance | $ / shares | $ 47.25
Performance Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Nonvested performance-based stock awards/units, Beginning balance | shares | 115,698
Granted | shares | 82,692
Forfeited/Cancelled | shares | (6,697)
Nonvested performance-based stock awards/units, Ending balance | shares | 191,693
Nonvested performance-based stock awards/units, Beginning balance | $ / shares | $ 52.25
Granted | $ / shares | 45.65
Forfeited/Cancelled | $ / shares | 65.60
Nonvested performance-based stock awards/units, Ending balance | $ / shares | $ 48.93
Performance Based Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Nonvested performance-based stock awards/units, Beginning balance | shares | 13,248
Forfeited/Cancelled | shares | (440)
Nonvested performance-based stock awards/units, Ending balance | shares | 12,808
Nonvested performance-based stock awards/units, Beginning balance | $ / shares | $ 56.05
Forfeited/Cancelled | $ / shares | 56.05
Nonvested performance-based stock awards/units, Ending balance | $ / shares | $ 56.05

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -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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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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