Borrowings - Additional Information (Detail) (USD $)							1 Months Ended								9 Months Ended
	Sep. 29, 2013	Dec. 31, 2012	Sep. 30, 2012	Jul. 16, 2013 Senior Credit Facility	Jul. 16, 2013 Senior Credit Facility Term Loan	Jul. 16, 2013 Senior Credit Facility Revolving Credit Facility	Jul. 16, 2013 New Senior Credit Facility	Jul. 16, 2013 New Senior Credit Facility Prime Rate Minimum	Jul. 16, 2013 New Senior Credit Facility Prime Rate Maximum	Jul. 16, 2013 New Senior Credit Facility Libor Rate Plus	Jul. 16, 2013 New Senior Credit Facility Libor Rate Plus Minimum	Jul. 16, 2013 New Senior Credit Facility Libor Rate Plus Maximum	Jul. 16, 2013 New Senior Credit Facility Rate Spread	Jul. 16, 2013 New Senior Credit Facility Revolving Credit Facility	Sep. 29, 2013 Convertible Notes Three Point Eight Seven Five Percent
Debt Instrument [Line Items]
Credit facility				$ 775,000,000	$ 375,000,000	$ 400,000,000								$ 850,000,000
Transaction fee							6,400,000
Transaction fees recorded as Deferred asset							6,400,000
Amortization of debt issuance costs							1,300,000
Federal funds effective rate plus							0.50%
Prime rate or one month LIBOR plus							1.00%
Applicable margin								0.25%	1.00%		1.25%	2.00%
Senior credit facility interest rate							1.93%			0.18%			1.75%
Interest rate	3.875%		3.875%												3.875%
Percentage of conversion price of applicable trading day															130.00%
Number of trading days															20 days
Number of consecutive trading days															30 days
Conversion price, per share															$ 79.72
Long-term borrowings	$ 980,688,000	$ 965,280,000