Balance Sheet Components (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Additional Financial Information Disclosure [Abstract]
Customers	$ 262,304	$ 260,412
Other	5,508	2,589
Total	267,812	263,001
Less allowance for doubtful accounts	7,812	6,961
Total receivables — net	260,000	256,040
Raw materials and components parts	141,671	137,584
Work in process	32,387	37,178
Finished goods	65,066	62,869
Total	239,124	237,631
Land and improvements	34,343	31,121
Buildings and improvements	157,946	148,749
Machinery, equipment and other	331,146	311,036
Office and transportation equipment	97,250	98,279
Construction in progress	13,377	14,335
Total	634,062	603,520
Less accumulated depreciation and amortization	393,117	383,977
Total property, plant and equipment — net	240,945	219,543
Payroll and related items	67,209	64,124
Management incentive compensation	12,599	21,567
Income taxes payable	3,836	9,305
Insurance	9,505	10,058
Warranty	7,936	7,196
Deferred revenue	9,885	11,813
Restructuring	6,636	6,056
Liability for uncertain tax positions	3,498	2,084
Accrued interest	1,230	1,738
Contingent consideration for acquisition	4,705	0
Other	26,633	29,468
Total accrued expenses	153,672	163,409
Pension and retiree medical obligations	76,190	90,584
Liability for uncertain tax positions	4,252	2,471
Deferred revenue	3,763	4,612
Other	18,160	16,610
Total other noncurrent liabilities	$ 102,365	$ 114,277