Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for obsolete inventory
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 36,269	$ 26,171	$ 21,603
Additions Charged to Costs and Expenses	19,770	21,648	12,868
Additions Through Acquisition	5,165	1,942	600
Other Changes Add (Deduct)	(16,029)	(13,492)	(8,900)
Balance at End of Period	45,175	36,269	26,171
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	8,644	7,424	5,895
Additions Charged to Costs and Expenses	7,085	2,169	2,347
Additions Through Acquisition	4,644	59	265
Other Changes Add (Deduct)	(934)	(1,008)	(1,083)
Balance at End of Period	$ 19,439	$ 8,644	$ 7,424