Balance Sheet Components (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Additional Financial Information Disclosure [Abstract]
Customers	$ 255,992	$ 257,114
Other	3,075	4,577
Total	259,067	261,691
Less allowance for doubtful accounts	5,841	5,596
Total receivables - net	253,226	256,095
Raw materials and components parts	133,470	139,229
Work in process	41,895	33,025
Finished goods	55,602	62,696
Total	230,967	234,950
Land and improvements	32,723	31,787
Buildings and improvements	150,316	141,952
Machinery, equipment and other	300,858	288,542
Office and transportation equipment	95,923	95,920
Construction in progress	9,201	12,040
Total	589,021	570,241
Less accumulated depreciation and amortization	375,533	351,080
Total property, plant and equipment - net	213,488	219,161
Payroll and related items	63,297	55,618
Management incentive compensation	20,949	15,974
Income taxes payable	11,746	10,284
Deferred income taxes	0	0
Insurance	7,741	8,974
Warranty	4,888	4,875
Deferred revenue	9,455	9,682
Restructuring	0	10,887
Liability for uncertain tax positions	1,201	2,679
Accrued interest	1,354	1,713
Contingent consideration for acquisition	0	3,528
Other	30,120	25,962
Total accrued expenses	150,751	150,176
Pension and retiree medical obligations	67,777	96,853
Liability for uncertain tax positions	4,624	4,989
Deferred revenue	5,578	6,534
Contingent consideration for acquisition	0	5,515
Other	15,087	14,484
Total other noncurrent liabilities	$ 93,066	$ 128,375