Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Reserves for uncertain tax positions net	$ 172,520,000	$ 166,279,000
Reduction in the provision for income taxes, if reserves not realized	173,000,000
Interest and penalties resulted in an income tax expense	$ 3,000,000	3,000,000	$ 1,000,000
Operational period	12 months
Federal statutory income tax rate	20.00%
Foreign tax credits		15,000,000	$ 17,000,000
Undistributed earnings of subsidiaries	$ 0	$ 0