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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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- Definition Potentially Dilutive Securities Outstanding [Line Items] + References No definition available. + Details
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- Definition 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 + Details
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- Definition 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 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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