Balance Sheet Components (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Balance Sheet Components [Line Items]
Customers	$ 257,114	$ 254,816
Other	4,577	3,889
Total	261,691	258,705
Less allowance for doubtful accounts	5,596	5,860
Total receivables - net	256,095	252,845
Raw materials and components parts	139,229	155,577
Work in process	33,025	40,506
Finished goods	62,696	58,175
Total	234,950	254,258
Land and improvements	31,787	30,320
Buildings and improvements	141,952	128,932
Machinery, equipment and other	288,542	278,936
Office and transportation equipment	95,920	98,341
Construction in progress	12,040	8,820
Total	570,241	545,349
Less accumulated depreciation and amortization	351,080	331,632
Total property, plant and equipment - net	219,161	213,717
Payroll and related items	55,618	51,728
Management incentive compensation	15,974	17,402
Income taxes payable	10,284	8,456
Deferred income taxes		167
Insurance	8,974	6,495
Warranty	4,875	4,417
Deferred revenue	9,682	7,954
Restructuring	10,887	5,875
Liability for uncertain tax positions	2,679	1,061
Accrued interest	1,713	1,424
Contingent consideration for acquisition	3,528	1,500
Other	25,962	24,217
Total accrued expenses	150,176	130,696
Pension and retiree medical obligations	96,853	91,542
Liability for uncertain tax positions	4,989	5,262
Deferred revenue	6,534	3,198
Contingent consideration for acquisition	5,515
Other	14,484	15,844
Total other noncurrent liabilities	$ 128,375	$ 115,846