Debt - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended
	Jan. 31, 2013	Nov. 30, 2012	Dec. 31, 2011	Mar. 31, 2013
Debt Instrument [Line Items]
Amount of final principal payment	$ 10,000,000	$ 134,557,000
Amount of bank credit facility			600,000,000	500,000,000
Facility Expiration date			Dec. 15, 2016	Mar. 12, 2018
Borrowing capacity description				Fluctuates with the level of eligible accounts receivable and inventory and may be less than $500,000,000 at any point in time.
Amended Line Of Credit
Debt Instrument [Line Items]
Amount of bank credit facility				$ 500,000,000
Facility Expiration date				Mar. 12, 2018
Line of Credit
Debt Instrument [Line Items]
Applicable margin for LIBOR based borrowing				1.50%
Line of Credit | Minimum
Debt Instrument [Line Items]
Applicable margin for LIBOR based borrowing				1.50%
Line of Credit | Maximum
Debt Instrument [Line Items]
Applicable margin for LIBOR based borrowing				2.00%