Contingencies - Additional Information (Detail) - US Attorney Prescription Drug Investigation $ in Thousands	1 Months Ended
	Dec. 31, 2017 USD ($)
Other Commitments [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 63,700
Incremental Cash Portion
Other Commitments [Line Items]
Litigation Settlement, Amount Awarded to Other Party	41,500
Cash Paid For Portion Previously Refunded
Other Commitments [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 22,200