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Contingencies - Additional Information (Detail) $ in Thousands |  | 1 Months Ended
--- | --- | ---
Aug. 15, 2017 | Dec. 31, 2017 USD ($)
US Attorney Prescription Drug Investigation |  |
Other Commitments [Line Items] |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 63,700
Stockholder Derivative Litigation |  |
Other Commitments [Line Items] |  |
Loss Contingency Number of Previously Disclosed Lawsuits Consolidated Into One | 3 |
Incremental Cash Portion | US Attorney Prescription Drug Investigation |  |
Other Commitments [Line Items] |  |
Litigation Settlement, Amount Awarded to Other Party |  | 41,500
Cash Paid For Portion Previously Refunded | US Attorney Prescription Drug Investigation |  |
Other Commitments [Line Items] |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 22,200

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- Details
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