Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for obsolete inventory
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 47,119	$ 45,175	$ 36,269
Additions Charged to Costs and Expenses	11,565	36,150	19,770
Additions Through Acquisition	1,947	0	5,165
Other Changes Add (Deduct)	(12,288)	(34,206)	(16,029)
Balance at End of Period	48,343	47,119	45,175
Allowance for doubtful accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	10,914	19,439	8,644
Additions Charged to Costs and Expenses	1,058	(965)	7,085
Additions Through Acquisition	60	0	4,644
Other Changes Add (Deduct)	(2,581)	(7,560)	(934)
Balance at End of Period	$ 9,451	$ 10,914	$ 19,439