Stock-Based Compensation and Stock Awards - Schedule of Information for Stock Option Plans (Detail) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
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)	224,087
Weighted-average exercise price of outstanding options (in dollars per share)	$ 63.57
Number of securities remaining available for future issuance under equity compensation plan (in shares)	1,279,330
RSA and DSA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	422,058
Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	288,093	264,274
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)	224,087
Weighted-average exercise price of outstanding options (in dollars per share)	$ 63.57
Number of securities remaining available for future issuance under equity compensation plan (in shares)	1,279,330

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- Definition

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://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

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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.

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