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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended |
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Sep. 30, 2013
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| Commitment And Contingencies [Line Items] | |
| Annual interest expense | $ 17.5 |
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Senior Notes [Member]
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| Commitment And Contingencies [Line Items] | |
| Debt instrument payment of interest | Semi-annually on June 15 and December 15, beginning December 15, 2013. |