Allocation of Acquisition Costs to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Apr. 28, 2014	Dec. 31, 2013	Mar. 18, 2013
Business Acquisition [Line Items]
Goodwill	$ 1,396,529	$ 1,321,277		$ 1,349,456
Novotema
Business Acquisition [Line Items]
Accounts receivable	8,029
Inventory	2,886
Other current assets, net of cash acquired	1,484
Property, plant and equipment	11,844
Goodwill	33,934
Intangible assets	20,011
Total assets acquired	78,188
Total liabilities assumed	(17,090)
Net assets acquired	61,098
Alfa
Business Acquisition [Line Items]
Accounts receivable	13,487
Inventory	11,036
Other current assets, net of cash acquired	3,367
Property, plant and equipment	8,395
Goodwill	71,191
Intangible assets	32,058
Total assets acquired	139,534
Total liabilities assumed	(26,944)
Net assets acquired	112,590
CPS
Business Acquisition [Line Items]
Accounts receivable	945
Inventory	442
Other current assets, net of cash acquired	79
Property, plant and equipment	1,084
Goodwill	9,575
Intangible assets	12,290
Total assets acquired	24,415
Total liabilities assumed	(235)
Net assets acquired	24,180
Other
Business Acquisition [Line Items]
Accounts receivable	0
Inventory	1,102
Other current assets, net of cash acquired	0
Property, plant and equipment	0
Goodwill	748
Intangible assets	0
Total assets acquired	1,850
Total liabilities assumed	0
Net assets acquired	1,850
Acquisitions in 2015
Business Acquisition [Line Items]
Accounts receivable	22,461
Inventory	15,466
Other current assets, net of cash acquired	4,930
Property, plant and equipment	21,323
Goodwill	115,448
Intangible assets	64,359
Total assets acquired	243,987
Total liabilities assumed	(44,269)
Net assets acquired	$ 199,718
Aegis
Business Acquisition [Line Items]
Accounts receivable			$ 1,147
Inventory			6,230
Other current assets, net of cash acquired			232
Property, plant and equipment			2,988
Goodwill			7,711
Intangible assets			8,770
Total assets acquired			27,078
Total liabilities assumed			(1,633)
Net assets acquired			$ 25,445
FTL
Business Acquisition [Line Items]
Accounts receivable					$ 3,454
Inventory					4,524
Other current assets, net of cash acquired					131
Property, plant and equipment					1,357
Goodwill					17,994
Intangible assets					13,016
Total assets acquired					40,476
Total liabilities assumed					(5,939)
Net assets acquired					$ 34,537