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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | Aug. 31, 2015 USD ($) Lawsuits | Dec. 31, 2014 Lawsuits
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Commitments and Contingencies Disclosure [Line Items] |  |
Number of lawsuits | 92 |
Insurance coverage subject to deductible limit | $ | $ 250 |
Delaware Cases [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Number of lawsuits |  | 2
Washington Case [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Number of lawsuits |  | 1
Quest Integrity [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Number of lawsuits |  | 3

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