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Schedule of Condensed Consolidated Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change In Accounting Principle      
Net income $ 217,049 $ 369,873 $ 384,820
Less: Income from discontinued operations   1,545 5,128
Less: Gain on disposal of discontinued operations   24,371  
Income from continuing operations 217,049 343,957 379,692
Depreciation 55,049 51,040 52,810
Amortization 87,750 53,338 40,706
Stock-based compensation 39,920 32,337 29,777
Provision for excess and obsolete inventory 26,849 11,601 5,971
Non cash charge for the sale of inventories revalued at the date of acquisition 6,089 12,178  
Retirement plan actuarial losses 23,320 13,564 (1,351)
Deferred taxes 5,556 (146,949) (1,519)
Other 498 1,509 2,528
Accounts receivable (24,093) 66,367 (50,418)
Inventories 17,652 (615) 3,715
Deferred revenue and customer advances (14,627) (68,359) 72,744
Accounts payable and other accrued expenses (32,810) (48,222) 62,201
Retirement plan contributions (4,778) (11,851) (52,452)
Accrued income taxes 19,804 (8,727) 8,465
Net cash provided by continuing operations 404,532 278,568 561,329
Net cash provided by discontinued operations   (4,804) 4,957
Net cash provided by operating activities 404,532 273,764 566,286
Net cash used for investing activities (603,940) (81,457) (627,660)
Net cash provided by financing activities (35,408) (16,308) 42,374
Decrease in cash and cash equivalents (234,816) 175,999 (19,000)
Cash and cash equivalents at beginning of year 573,736 397,737 416,737
Cash and cash equivalents at end of year 338,920 573,736 397,737
Originally Reported
      
Change In Accounting Principle      
Net income   373,809 379,730
Less: Income from discontinued operations   1,545 5,128
Less: Gain on disposal of discontinued operations   24,371  
Income from continuing operations   347,893 374,602
Depreciation   51,040 52,810
Amortization   62,284 46,217
Stock-based compensation   32,337 29,777
Provision for excess and obsolete inventory   11,601 5,971
Non cash charge for the sale of inventories revalued at the date of acquisition   12,178  
Deferred taxes   (146,669) (3,670)
Other   1,911 2,907
Accounts receivable   66,367 (50,418)
Inventories   (615) 3,715
Other assets   (22,600) 8,460
Deferred revenue and customer advances   (68,359) 72,744
Accounts payable and other accrued expenses   (48,222) 62,201
Retirement plan contributions   (11,851) (52,452)
Accrued income taxes   (8,727) 8,465
Net cash provided by continuing operations   278,568 561,329
Net cash provided by discontinued operations   (4,804) 4,957
Net cash provided by operating activities   273,764 566,286
Net cash used for investing activities   (81,457) (627,660)
Net cash provided by financing activities   (16,308) 42,374
Decrease in cash and cash equivalents   175,999 (19,000)
Cash and cash equivalents at beginning of year   397,737 416,737
Cash and cash equivalents at end of year   573,736 397,737
Effect Of Accounting Change
      
Change In Accounting Principle      
Net income   (3,936) 5,090
Income from continuing operations   (3,936) 5,090
Amortization   (8,946) (5,511)
Retirement plan actuarial losses   13,564 (1,351)
Deferred taxes   (280) 2,151
Other   (402) (379)
As Adjusted
      
Change In Accounting Principle      
Net income   369,873 384,820
Less: Income from discontinued operations   1,545 5,128
Less: Gain on disposal of discontinued operations   24,371  
Income from continuing operations   343,957 379,692
Depreciation   51,040 52,810
Amortization   53,338 40,706
Stock-based compensation   32,337 29,777
Provision for excess and obsolete inventory   11,601 5,971
Non cash charge for the sale of inventories revalued at the date of acquisition   12,178  
Retirement plan actuarial losses   13,564 (1,351)
Deferred taxes   (146,949) (1,519)
Other   1,509 2,528
Accounts receivable   66,367 (50,418)
Inventories   (615) 3,715
Other assets   (22,600) 8,460
Deferred revenue and customer advances   (68,359) 72,744
Accounts payable and other accrued expenses   (48,222) 62,201
Retirement plan contributions   (11,851) (52,452)
Accrued income taxes   (8,727) 8,465
Net cash provided by continuing operations   278,568 561,329
Net cash provided by discontinued operations   (4,804) 4,957
Net cash provided by operating activities   273,764 566,286
Net cash used for investing activities   (81,457) (627,660)
Net cash provided by financing activities   (16,308) 42,374
Decrease in cash and cash equivalents   175,999 (19,000)
Cash and cash equivalents at beginning of year   397,737 416,737
Cash and cash equivalents at end of year   $ 573,736 $ 397,737