Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for obsolete inventory
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 26,171	$ 21,603	$ 17,357
Additions Charged to Costs and Expenses	21,648	12,868	9,966
Additions Through Acquisition	1,942	600	2,423
Other Changes Add (Deduct)	(13,492)	(8,900)	(8,143)
Balance at End of Period	36,269	26,171	21,603
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	7,424	5,895	4,268
Additions Charged to Costs and Expenses	2,169	2,347	75
Additions Through Acquisition	59	265	2,192
Other Changes Add (Deduct)	(1,008)	(1,083)	(640)
Balance at End of Period	$ 8,644	$ 7,424	$ 5,895