Stock-Based Compensation and Stock Awards - Schedule of Information for Stock Option Plans (Detail) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options (in shares)	280,212
Weighted-average exercise price of outstanding options (in dollars per share)	$ 59.84
Number of securities remaining available for future issuance under equity compensation plan (in shares)	198,472
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	397,298	269,383
Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	264,274	196,219
Stock options \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options (in shares)	280,212
Weighted-average exercise price of outstanding options (in dollars per share)	$ 59.84
Number of securities remaining available for future issuance under equity compensation plan (in shares)	198,472
2004 Plan \| Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	414,812
2004 Plan \| Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	264,274

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Share Based Compensation Arrangement By Share Based Payment Award Number of securities remaining available for future issuance under equity compensation plan.

+ References

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Number of securities to be issued upon exercise of outstanding options.

+ References

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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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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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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