Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for obsolete inventory
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 21,603	$ 17,357	$ 15,943
Additions Charged to Costs and Expenses	12,868	9,966	6,258
Additions Through Acquisition	600	2,423	15
Other Changes Add (Deduct)	(8,900)	(8,143)	(4,859)
Balance at End of Period	26,171	21,603	17,357
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	5,895	4,268	4,473
Additions Charged to Costs and Expenses	2,347	75	375
Additions Through Acquisition	265	2,192	365
Other Changes Add (Deduct)	(1,083)	(640)	(945)
Balance at End of Period	$ 7,424	$ 5,895	$ 4,268