Property and Equipment, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012 Restructuring Fiscal 2012 Plan Capitalized Software
Property, Plant and Equipment [Line Items]
Net book value of capitalized computer software costs written off			$ 4,020
Depreciation expense	$ 38,841	$ 42,512