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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 6 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 2008 Incentive Compensation Plan [Member] | Sep. 30, 2014 Non-Employee Directors' Stock Options [Member] | Sep. 30, 2014 Employee Stock Option [Member] | Sep. 30, 2014 Restricted Stock Shares [Member] | Dec. 31, 2013 Restricted Stock Shares [Member] | Jun. 30, 2014 Deferred Stock Units to be Settled in Shares [Member] | Sep. 30, 2014 Restricted Stock Units RSU [Member] | Dec. 31, 2013 Restricted Stock Units RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock subject to awards of stock options or stock appreciation rights payable in shares |  |  |  | 1.0 |  |  |  |  |  |  |
Common stock subject to any other form of award |  |  |  | 1.67 |  |  |  |  |  |  |
Common stock available for future share-based awards |  |  |  | 6,100,000 |  |  |  |  |  |  |
Shares issuable upon exercise of outstanding options | 4,041,000 | 4,041,000 | 3,900,000 | 4,000,000 |  |  |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 641,000 | 641,000 | 760,000 |  |  |  | 50,000 | 221,000 |  | 591,000 | 539,000
Number of shares to reduce shares available to grant by upon vesting of deferred stock units | 117,000 | 117,000 | 0 |  |  |  |  |  |  |  |
Estimated pretax compensation expense | $ 6.0 | $ 6.0 |  |  |  |  |  |  |  |  |
Estimated pretax compensation expenses expiration, years |  | 4 years |  |  |  |  |  |  |  |  |
Employee stock options exercisable in percentage |  |  |  |  |  | 25.00% |  |  |  |  |
Service period in years |  | 4 years |  |  |  | 4 years | 4 years |  | 3 years |  |
Expiration period in years |  |  |  |  | 10 years | 10 years |  |  |  |  |
Vesting period in years |  |  |  |  | 4 |  |  |  |  |  |
Restricted stock awards settled in stock exercisable in percentage |  | 25.00% |  |  |  |  |  |  |  |  |
Long-term incentive, cash-based awards |  | 3 years |  |  |  |  | 3 years |  |  |  |
Restricted stock awards settled in cash exercisable in percentage |  | 25.00% |  |  |  |  |  |  |  |  |
Stock compensation and recognized liability | 0.8 | 3.2 |  |  |  |  |  |  |  |  |
Fair value of the liability incurred through |  | 3.0 |  |  |  |  |  |  |  |  |
Performance unit award expenses | $ 1.2 |  |  |  |  |  |  |  |  |  |

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- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition The number of years over which estimated share-based compensation expense for all unvested share-based awards that have been granted to participants will be recognized. + References No definition available. + Details
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- Definition Fair value of liability incurred during period on performance unit awards to be settled in cash. + References No definition available. + Details
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- Definition The aggregate amount of expense recorded during the period for long term incentive awards granted to employees not stock-based to be settled in cash. + References No definition available. + Details
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- Definition The yearly percentage that vests for restricted stock awards. + References No definition available. + Details
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- Definition The yearly percentage that vests for restricted stock units settled in cash. + References No definition available. + Details
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- Definition The vesting period in years for stock option grants. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment deferred stock units that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + 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 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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- 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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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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