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Stockholders' Equity and Stock-Based Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Stock Options Plan [Member] Stock_Plan Directors | Sep. 30, 2013 Stock Options Plan [Member] | Sep. 30, 2014 Stock Options Plan [Member] Minimum [Member] | Sep. 30, 2014 Stock Options Plan [Member] Maximum [Member] | Sep. 30, 2014 Stock Equivalent Units [Member] | Sep. 30, 2013 Stock Equivalent Units [Member] | Sep. 30, 2014 Stock Equivalent Units [Member] Minimum [Member] | Sep. 30, 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 | 5,126,216 | 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 of stock options exercisable and fully vested |  |  | 135,621 |  |  |  |  |  |  |
Fully vested stock options with performance conditions attached |  |  | 51,001 |  |  |  | 84,267 |  |  |
Stock option compensation cost of SEUs |  |  | $ 1.7 | $ 1.9 |  |  | $ 0.3 | $ 6.3 |  |
Total intrinsic value of options exercised |  |  | 0.9 | 3.2 |  |  | 3.5 | 2.1 |  |
Total compensation cost related to non-vested stock options not yet recognized |  |  | 5.3 |  |  |  |  |  |  |
Expected compensation cost recognized over the weighted-average period |  |  | 2 years 5 months 16 days |  |  |  | 1 year 7 months 17 days |  |  |
Number of exercisable SEUs |  |  |  |  |  |  | 95,526 |  |  |
Maximum cash bonus under long-term incentive plan | $ 3 |  |  |  |  |  |  |  |  |

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