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Share Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Restructuring Charges [Member] | Sep. 30, 2013 Performance Unit Incentive Plan (PUP) [Member] | Sep. 30, 2013 Performance Unit Incentive Plan (PUP) [Member] | Sep. 30, 2012 Performance Unit Incentive Plan (PUP) [Member] | Dec. 31, 2012 Performance Unit Incentive Plan (PUP) [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2012 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2012 Stock Options [Member] | Sep. 30, 2013 Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock [Member] | Sep. 30, 2013 Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock [Member] | Sep. 30, 2013 Restricted Stock Units and Performance Based Restricted Stock Units [Member] | Dec. 31, 2012 Restricted Stock Units and Performance Based Restricted Stock Units [Member] | Jan. 31, 2012 PBRS [Member] | Feb. 28, 2013 Restricted Stock Units [Member] | Feb. 28, 2012 Restricted Stock Units [Member] | Sep. 30, 2013 Restricted Stock Units [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation before income tax benefit | $ 1,202,000 | $ 1,670,000 | $ 3,569,000 | $ 4,524,000 | $ 253,000 | $ 94,000 |  |  |  | $ 3,000 | $ 148,000 | $ 104,000 | $ 450,000 | $ 802,000 | $ 890,000 | $ 2,522,000 | $ 2,610,000 |  |  |  |  |  |
Unamortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,100,000 |  | 4,100,000 |  |  |  |  |  |  |
Recognition Period of Unrecognized cost |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |
Repurchase of Common Stock for Employee Tax Withholding Obligations amount |  |  | 1,300,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased shares tax withholding |  |  | 48,937 | 53,019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Available for Grant | 1,005,372 |  | 1,005,372 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities related to restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 405,000 | 633,000 |  |  |  |
Payments To Employees |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000 | 300,000 | 257,000 |
Liability awards recorded |  |  |  |  |  |  | 4,600,000 |  | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PUP award vested |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  | 161,186 |  |  |  |  |  |  | 11,300
Total unrecognized cost related to non-vested stock option awards | $ 3,000 |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer). + References No definition available. + Details
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- Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Net number of share options (or share units) granted during the period. + 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)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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