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Stock-based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended
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Apr. 30, 2013 | Sep. 30, 2013
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Treasury stock acquisition price |  | $ 85,733
Employee Stock Option |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Treasury stock shares acquired |  | 637,624
Acquired to satisfy the exercise price | Employee Stock Option |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Treasury stock acquisition price |  | 12,300
Acquired to satisfy payroll tax withholding obligations | Employee Stock Option |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Treasury stock acquisition price |  | $ 2,900
Performance Unit Awards 2010 |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Performance period |  | 3 years
Award description |  | Generally, the recipients will receive a target number of shares if the Company's total shareholder return is positive and, when compared to the peer group, is at the 50thpercentile and two times the target if at the 75th percentile or higher.
Target number of shares |  | 178,750
Shares issued | 357,500 |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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