Retirement Plan Benefits - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Matching contribution percentage	6.00%
Percentage of matching contributions immediately vested	100.00%
Amount of contributions made by the employer	$ 73,200,000	$ 34,300,000	$ 27,100,000
Description of estimated future employer contributions in next fiscal year	We did not make any contributions to the Pension Plan in 2011 or 2010 and we do not expect to make a contribution to the Pension Plan in 2012.
Under-funded status of the Pension Plans	86,800,000	47,600,000
Accumulated actuarial loss and prior services cost reclassified from accumulated comprehensive loss to a component of net periodic benefit cost	11,200,000
Pension Plans net losses, primarily the result of a decrease in the discount rate at the end of 2011	41,500,000
Total balance included in accumulated other comprehensive loss that will be recognized as a component of net periodic benefit costs in 2012	12,900,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Matching contribution amount per quarter	750
The deferred compensation program limit for employee's investment allocation in the company stock fund	30.00%
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset at fair value	395,859,000	379,617,000	353,562,000
Pension Plans, Defined Benefit | Data General | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Pension plans' asset at fair value	$ 300,000