Contingencies - Additional Information (Detail) $ in Thousands		1 Months Ended	9 Months Ended
	Aug. 15, 2017	Dec. 31, 2017 USD ($)	Sep. 30, 2020
Other Commitments [Line Items]
Corporate Integrity Agreement Period			5 years
Corporate Integrity Agreement Expiration Date			Oct. 22, 2019
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