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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 31, 2013 | Apr. 30, 2013 | Feb. 28, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Apr. 30, 2013 Minimum [Member] | Apr. 30, 2013 Maximum [Member] | Oct. 31, 2013 Subsequent Event [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSU's issued |  |  |  | 385,000 |  |  |  |  |  | 385,000 |  | 301,000 |  |  |  |  | 71,000 | 63,000
Performance of RSU's Vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100% or 40% on April 1, 2014 | 100% or 40% on April 1, 2013
Compensation expense Estimate vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Modified Estimate vesting of RSU's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00%
Dividend declared and paid per share |  |  |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.14 | $ 0.14 | $ 0.14 |  |  |  |  |  |  |  |  |
Aggregate dividend declared for the year |  |  |  |  |  |  |  |  |  | $ 9.4 | $ 9.5 |  |  |  |  |  |  |
Dividend declared |  |  |  | $ 0.15 |  |  | $ 0.14 |  |  | $ 0.45 | $ 0.42 |  |  |  | $ 0.15 |  |  |
Aggregate cost of repurchase of common stock |  |  |  |  |  |  |  |  |  | 320.0 |  |  |  |  |  |  |  |
Authorized to Purchase of common stock under the stock repurchase program | 25.0 |  | 50.0 |  |  |  |  |  |  | 385.0 |  |  |  |  |  |  |  |
Cumulative repurchase of common stock |  |  |  | 12,200,000 |  |  |  |  |  | 12,200,000 |  |  |  |  |  |  |  |
Repurchase of common Stock |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Cumulative aggregate cost of repurchase of common stock |  |  |  |  |  |  |  |  |  | 109.2 |  |  |  |  |  |  |  |
Repurchase of self-tender |  | 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock price per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.00 | $ 36.00 |  |  |  |
Increment in per share value |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock |  | 2,054,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock |  | $ 36.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate price of stock |  | 74.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses related to tender offer |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, retired |  |  |  |  |  |  |  |  |  | 11,700,000 |  |  |  |  |  |  |  |
Carrying value of retired stock |  |  |  |  |  |  |  |  |  | $ 303.0 |  |  |  |  |  |  |  |

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