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Commitments and Contingencies - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | 1 Months Ended | ||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Mar. 31, 2010
Oklahoma City Economic Development Trust [Member]
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Sep. 30, 2014
Oklahoma City Economic Development Trust [Member]
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Dec. 31, 2013
Oklahoma City Economic Development Trust [Member]
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Mar. 31, 2010
Oklahoma City Economic Development Trust [Member]
Minimum [Member]
Job
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| Other Commitments [Line Items] | ||||||||
| Up-front job creation payment from Trust | $ 2,000,000 | |||||||
| Number of jobs created within a 5 year period | 492 | |||||||
| Average first year wage | 37,000 | |||||||
| Term of agreement | 5 years | |||||||
| Capital investment in the project | 15,000,000 | |||||||
| Earned job creation payments | 1,900,000 | 1,500,000 | ||||||
| Operating lease expiration period | 2014 to 2019 | |||||||
| Operating lease rent expense | $ 1,000,000 | $ 500,000 | $ 2,400,000 | $ 1,400,000 | ||||