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Public Equity Offerings - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
0 Months Ended | |||||||
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Sep. 19, 2012
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Nov. 15, 2011
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Nov. 10, 2010
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Dec. 31, 2012
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Oct. 03, 2012
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Dec. 31, 2011
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Nov. 16, 2011
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Nov. 11, 2010
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| Equity [Line Items] | ||||||||
| Common stock, issued | 5,000,000 | 4,000,000 | 5,750,000 | 38,829,368 | 38,829,368 | |||
| Additional purchase of common stock | 325,000 | 600,000 | 862,500 | |||||
| Transaction costs | $ 8.0 | $ 6.6 | $ 5.7 | |||||
| Received net proceeds | $ 154.4 | $ 122.2 | $ 101.8 | |||||