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Indebtedness - Subsequent Development - Additional Information (Detail) (USD $) | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended
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Sep. 30, 2014 CommercialBank | Sep. 30, 2014 CommercialBank | Oct. 16, 2014 Subsequent Event CommercialBank | Sep. 30, 2014 Alternate Base Rate | Sep. 30, 2014 Alternate Base Rate Credit Facility | Oct. 16, 2014 Alternate Base Rate Subsequent Event | Sep. 30, 2014 LIBOR Rate | Sep. 30, 2014 LIBOR Rate Credit Facility | Oct. 16, 2014 LIBOR Rate Subsequent Event | Sep. 30, 2014 Minimum | Sep. 30, 2014 Minimum Credit Facility | Oct. 16, 2014 Minimum Subsequent Event | Sep. 30, 2014 Maximum | Sep. 30, 2014 Maximum Credit Facility | Oct. 16, 2014 Maximum Subsequent Event
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank Credit facility, Facility amount | $ 1,750,000,000 | $ 1,750,000,000 | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Bank Credit facility, Borrowing base | $ 2,000,000,000 | $ 2,000,000,000 | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage holding of commercial banks, Maximum | 9.00% | 9.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial banks included in current bank group | 28 | 28 | 29 |  |  |  |  |  |  |  |  |  |  |  |
Notice period for increase in facility amount | 20 days |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of loan |  |  | Oct. 16, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  | 0.375% | 0.30% |  |  |  |  |  |  |  |  |  |  |  |
Minimum range of base rate |  |  |  | 0.50% | 0.125% | 0.25% | 1.50% | 1.125% | 1.25% |  |  |  |  |  |
Maximum range of base rate |  |  |  | 1.50% | 0.75% | 1.25% | 2.50% | 1.75% | 2.25% |  |  |  |  |  |
Interest rate margin |  |  |  | 0.75% |  | 0.50% | 1.75% |  | 1.50% |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  |  |  |  |  |  |  |  | 0.375% | 0.15% | 0.30% | 0.50% | 0.30% | 0.375%

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