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Stockholders' Equity and Stock-Based Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Stock Options Plan [Member] Stock_Plan Directors | Mar. 31, 2013 Stock Options Plan [Member] | Mar. 31, 2014 Stock Options Plan [Member] Minimum [Member] | Mar. 31, 2014 Stock Options Plan [Member] Maximum [Member] | Mar. 31, 2014 Stock Equivalent Units [Member] | Mar. 31, 2013 Stock Equivalent Units [Member] | Mar. 31, 2014 Stock Equivalent Units [Member] Minimum [Member] | Mar. 31, 2014 Stock Equivalent Units [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 40,000,000 | 40,000,000 |  |  |  |  |  |  |  |
Number of shares issued | 29,554,500 | 29,554,500 |  |  |  |  |  |  |  |
Treasury stock, shares | 5,168,037 | 5,207,947 |  |  |  |  |  |  |  |
Number of active stock option plans |  |  | 4 |  |  |  |  |  |  |
Number of active stock option plans for employees |  |  | 2 |  |  |  |  |  |  |
Number of active stock option plans for non-employee directors |  |  | 1 |  |  |  |  |  |  |
Range of stock vesting period |  |  |  |  | 24 months | 6 years |  |  | 11 months | 4 years
Expiration term for stock granted |  |  | 10 years |  |  |  | 10 years |  |  |
Aggregate number of shares of common stock reserved for issuance which can be granted |  |  | 2,640,000 |  |  |  |  |  |  |
Number exercisable and fully vested |  |  | 158,829 |  |  |  |  |  |  |
Fully vested stock options with performance conditions attached |  |  | 67,001 |  |  |  | 88,645 |  |  |
Total compensation cost of SEUs |  |  | $ 0.6 | $ 0.7 |  |  | $ 0.6 | $ 3.7 |  |
Total intrinsic value of options exercised |  |  | 0.5 | 1.9 |  |  | 3.0 | 1.2 |  |
Total compensation cost related to non-vested stock options not yet recognized |  |  | 3.8 |  |  |  |  |  |  |
Expected compensation cost recognized over the weighted average period |  |  | 2 years 3 months 22 days |  |  |  | 1 year 8 months 19 days |  |  |
Number of exercisable SEUs |  |  |  |  |  |  | 100,593 |  |  |
Maximum bonus under long-term incentive plan | $ 3.0 |  |  |  |  |  |  |  |  |

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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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