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Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 22 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 1 Months Ended
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Aug. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Person | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2012 2007 Omnibus Plan | Sep. 30, 2012 2007 Omnibus Plan | Apr. 11, 2012 2007 Omnibus Plan | Sep. 30, 2012 2005 Omnibus Plan | Sep. 30, 2013 Stock Option | Apr. 30, 2013 Performance Units | Jan. 31, 2013 Performance Units | Mar. 31, 2010 Performance Units | Mar. 31, 2013 Performance Units | Sep. 30, 2013 Performance Units | Dec. 31, 2011 Performance Units | Dec. 31, 2012 Performance Units December 31, 2013 | Sep. 30, 2013 Employee Stock Purchase Plan | Sep. 30, 2012 Employee Stock Purchase Plan | Sep. 30, 2013 Employee Stock Purchase Plan | Sep. 30, 2012 Employee Stock Purchase Plan | Sep. 01, 2009 Employee Stock Purchase Plan | Sep. 30, 2013 Restricted Share Units | Dec. 31, 2012 Restricted Share Units | Dec. 31, 2011 Restricted Share Units | Dec. 31, 2012 Restricted Share Units December 31, 2013 | Apr. 30, 2013 Restricted Share Units Adjustment Special Cash Dividend | Jan. 31, 2013 Restricted Share Units Adjustment Special Cash Dividend | Apr. 30, 2013 Restricted Share Units Group One | Jan. 31, 2013 Restricted Share Units Group One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended Omnibus Plan, increase in number of common shares authorized for issuance |  |  |  |  |  |  | 6,314,496 | 2,544,327 | 5,593,200 | 495,915 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares authorized for issuance |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share | $ 2.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation cost |  | $ 5,258 | $ 5,579 | $ 21,761 | $ 22,745 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in stock-based compensation costs |  | 1,670 |  | 1,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost for options |  | 25,728 |  | 25,728 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining requisite vesting period |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  | 1 year 1 month 6 days |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |
Minimum vesting schedules, months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |
Maximum vesting schedules, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Shares issued on vested awards other than options |  |  |  |  |  |  |  |  |  |  |  |  |  | 503,969 |  |  | 243,781 |  |  |  |  |  |  |  | 4,000 | 102,000 |  | 1,819 | 100,800 |  |
RSUs settled on vesting by issuing shares (net of minimum tax withholding) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188,966 |  |  |  | 240 | 13,557 | 533 | 13,719
Vested RSU against which shares to be issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,286 |  |  |  |
Unrecognized share-based compensation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,429 |  |  |  |  |  |  |  | 12,427 |  |  |  |  |  |  |
Percentage of actual vesting |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.90% |  |  | 128.90% | 122.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued net of tax withholdings |  |  |  |  |  |  |  |  |  |  |  | 4,679 | 156,511 |  | 334,922 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued on vested awards other than options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 231,029 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options vesting period, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation cost |  |  |  | 5,500 |  | 4,109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation cost recognition period |  |  |  |  |  | 21 months 15 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of minimum percentage of voting power of company for change of control |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employee affected |  |  |  | 123 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period not yet recognized |  |  |  | 1 year 10 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value per share allowed to eligible employees to purchase through payroll deductions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Maximum percentage of employee's base salary allowed to be purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  | 15.00% |  |  |  |  |  |  |  |  |  |
Maximum dollar amount of common shares allowed to be purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |
Common shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  | 4,200,000 |  |  |  |  |  |  |  |  |  |
Number of common shares issued under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,040 | 63,106 |  |  |  |  |  |  |  |  |
Compensation expense for ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54 | $ 34 | $ 170 | $ 111 |  |  |  |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans. + References No definition available. + Details
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- Definition Represents the discounted fair value (in percentage) at which shares will be issued to eligible employees under the Employee Stock Purchase Plan. + References No definition available. + Details
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- Definition Maximum dollar amount of common shares allowed to be purchased. + References No definition available. + Details
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- Definition It represents the minimum percentage voting power of the Company which needs to be transferred in a share purchase transaction for triggering the definition of change of control as per Company's stock based compensation plan. + References No definition available. + Details
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- Definition Shares awarded to employees, net of shares for the payment of withholding taxes for meeting certain performance targets.This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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- Definition Maximum vesting period (in years) for share based awards other than stock options. + References No definition available. + Details
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- Definition Minimum vesting period (in months) for share based awards other than stock options. + References No definition available. + Details
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- Definition It represents the actual/expected vesting of Share Based Payment Award other than options. + References No definition available. + Details
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- Definition It represents the number of awards other than options which have vested earlier but shares are issued now due to post vesting restriction or finalization of vesting. + References No definition available. + Details
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- Definition It represents the number of awards other than options which have vested but shares against which are yet to be issued due to post vesting restriction or finalization of vesting. + References No definition available. + Details
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- Definition It represents the number of restricted stock units which have vested but are yet to be issued due to post vesting restriction. + References No definition available. + Details
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- Definition It represents the period over which the incremental compensation cost arising as a result of the modification is to be recognized. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (b) -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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of employees affected by the modification of an equity-based compensation plan. + 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 (h)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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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