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Stock Options - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of unissued common stock available for grant under the plans | 2.6 |
Share-based compensation expense | $ 10.6 | $ 10.8
Cash received from stock options exercised | 3.3 | 4.5
Performance-Based Unit | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares which will vest after achievement of goals | 0 |
Performance-Based Unit | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares which will vest after achievement of goals | 1.5 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 4.2 | 2.7
Total unrecognized compensation cost | 8.9 |
Unrecognized compensation cost, Weighted-average recognition period | 2 years 3 months 18 days |
Aggregate weighted-average grant-date fair value of units granted | 12.7 | 5.0
Aggregate weighted-average grant-date fair value of units vested | 2.7 | 4.3
Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 6.4 | 8.1
Total intrinsic value of options exercised | 4.6 | 5.7
Total unrecognized compensation cost | $ 4.0 |
Unrecognized compensation cost, Weighted-average recognition period | 2 years |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number of Shares Vesting After Achievement of Goals + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, other than options, grants in period, weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, other than options, vested in period, weighted average grant date fair value. + References No definition available. + 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 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 The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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