Stock-Based Compensation and Stock Awards - Schedule of Information for Stock Option Plans (Detail) - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options (in shares)	351,959
Weighted-average exercise price of outstanding options (in dollars per share)	$ 57.66
Number of securities remaining available for future issuance under equity compensation plan (in shares)	184,773
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	269,383	193,596
Performance Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	196,219	135,969
Equity Compensation Plans Approved By Stockholders [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options (in shares)	351,959
Weighted-average exercise price of outstanding options (in dollars per share)	$ 57.66
Number of securities remaining available for future issuance under equity compensation plan (in shares)	184,773
Equity Compensation Plans Not Approved By Shareholders [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities to be issued upon exercise of outstanding options (in shares)	0
Weighted-average exercise price of outstanding options (in dollars per share)	$ 0.00
Number of securities remaining available for future issuance under equity compensation plan (in shares)	0
2004 Plan [Member] \| Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	282,805
2004 Plan [Member] \| Performance Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock and units (in shares)	196,219

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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=6415400&loc=d3e5070-113901

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