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Change in Accounting Principle and Change in Accounting Estimate - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | |
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Sep. 30, 2012
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Sep. 30, 2012
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Sep. 30, 2011
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Costs related to acquisition | $ 8,800,000 | $ 27,800,000 | |
| Net result of adoption of new accounting policy | 500,000 | 2,000,000 | |
| Depreciation as an operating expense | 3,700,000 | 6,105,000 | 2,345,000 |
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Previous Accounting Guidance
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Costs related to acquisition | 8,200,000 | 25,700,000 | |
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Impact of Change in Accounting Principle
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Costs related to acquisition | $ 600,000 | $ 2,100,000 | |