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Fair Value of Financial Instruments - Schedule of Quantitative Information Associated with Fair Value Measurement of Our Nonrecurring Level 3 Inputs - Property and Equipment (Detail) (Significant Unobservable Inputs (Level 3) [Member], Income Approach [Member])
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6 Months Ended |
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Jun. 30, 2014
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Significant Unobservable Inputs (Level 3) [Member] | Income Approach [Member]
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |
| Significant Unobservable Input | Expected proceeds from sale |