Quarterly Results - Additional Information (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
DOJ Reserve
Quarterly Financial Information [Line Items]
Unfavorable pre-tax reduction		$ 11,000,000.0		$ 31,900,000	$ 48,000,000.0	$ 9,500,000	$ 13,000,000.0
Unfavorable after-tax reduction	$ 6,200,000	$ 8,400,000		$ 24,500,000	$ 36,600,000	$ 7,200,000	$ 9,900,000
Tax reduction per diluted share	$ 0.07	$ 0.09		$ 0.26	$ 0.39	$ 0.08	$ 0.11
Provision For Asset Impairment
Quarterly Financial Information [Line Items]
Unfavorable pre-tax reduction	$ 97,600,000
Unfavorable after-tax reduction	$ 74,600,000
Tax reduction per diluted share	$ 0.84
Provision for Intangible Asset Impairment
Quarterly Financial Information [Line Items]
Unfavorable pre-tax reduction				$ 49,300,000
Unfavorable after-tax reduction				$ 37,700,000
Tax reduction per diluted share				$ 0.41
ASU 2016-09
Quarterly Financial Information [Line Items]
Favorable after tax impact	$ 1,700,000	$ 509,000	$ 10,900,000				$ 1,600,000
Favorable after tax impact per share diluted	$ 0.02	$ 0.01	$ 0.12				$ 0.02