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Summarizes Options which Deemed to be Anti-dilutive (Detail) - $ / shares		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Potentially Dilutive Securities Outstanding [Line Items]
Shares excluded from calculation of diluted earnings per share		512,500	12,500	512,500	12,500
February 9, 2014
Potentially Dilutive Securities Outstanding [Line Items]
Expiration Date				Feb. 10, 2024
Shares excluded from calculation of diluted earnings per share				300,000
Strike price per share				$ 32.38
January 1, 2015
Potentially Dilutive Securities Outstanding [Line Items]
Expiration Date				Jan. 01, 2025
Shares excluded from calculation of diluted earnings per share				200,000
Strike price per share				$ 28.37
November 2, 2005
Potentially Dilutive Securities Outstanding [Line Items]
Expiration Date	[1]			Nov. 03, 2015
Shares excluded from calculation of diluted earnings per share	[1]			12,500
Strike price per share	[1]			$ 37.70
[1] Represents anti-dilutive options at September 30, 2014.

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Potentially Dilutive Securities Outstanding [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Antidilution



-URI http://asc.fasb.org/extlink&oid=6505113



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Diluted Earnings Per Share



-URI http://asc.fasb.org/extlink&oid=6510752



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Contingent Stock Agreement



-URI http://asc.fasb.org/extlink&oid=6508534



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 50



-Paragraph 1



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Date the equity-based award expires, in CCYY-MM-DD format.

+ 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=6415400&loc=d3e5070-113901

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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