Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Unrecognized tax benefits, interest expense		$ 0		$ 900,000	$ 200,000
Valuation allowance recorded as a deferred tax expense		170,000,000
Deferred liabilities tax related to indefinite lived IP		75,000,000		75,000,000
Deferred income tax (benefit) provision		(203,000,000)		$ (31,721,000)	$ 16,528,000
Deferred tax benefit net of adjustments		$ 33,000,000
Effective income tax rate from continuing operations		4.90%	35.60%	4.80%	33.80%
Cash distribution from foreign subsidiaries to parent	$ 72,500,000
Undistributed earnings and profits in foreign subsidiary		$ 0		$ 0
Maximum
Income Taxes [Line Items]
Unrecognized tax benefits, interest expense			$ 100,000