Stock-Based Compensation and Stock Awards - Schedule of Information for Stock Option Plans (Detail) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	400,925
Weighted- average exercise price of outstanding options, warrants and rights (in dollars per shares)	$ 67.85
Number of securities remaining available for future issuance under equity compensation plan (in shares)	597,780
Unvested stock and units (in shares)	348,690	403,179
Percentage of achievement of performance conditions	100.00%
Stock options \| Stock options(Approved)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	400,925
Weighted- average exercise price of outstanding options, warrants and rights (in dollars per shares)	$ 67.85
Number of securities remaining available for future issuance under equity compensation plan (in shares)	597,780
RSA and DSA
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	385,010
Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	268,550	288,093

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

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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=116856206&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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