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Stock-Based Compensation (Stock Incentive Program Descriptions) - Additional Information (Detail) - shares | 12 Months Ended |
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Dec. 31, 2017 | Jan. 20, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Contractual term | 10 years |
2006 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares of common stock authorized | 13,000,000 |
Vesting period | 4 years |
Contractual term | 10 years |
2010 Directors Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares of common stock authorized | 500,000 |
Contractual term | 10 years |
2015 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares of common stock authorized |  | 7,700,000
Vesting period | 4 years |
Contractual term | 10 years |
Multiplier used when issuing PSUs, restricted stock and RSUs |  | 2.5
Minimum [Member] | 2006 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2018 |
Minimum [Member] | 2010 Directors Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2018 |
Minimum [Member] | 2015 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2025 |
Maximum [Member] | 2006 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2024 |
Maximum [Member] | 2010 Directors Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2019 |
Maximum [Member] | 2015 Employee Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date of options | 2026 |

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- Definition Year the equity-based award expires. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, common stock multiplier used in determining issuable shares. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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