Borrowings - Additional Information (Detail) (USD $)	6 Months Ended			1 Months Ended	6 Months Ended					3 Months Ended		6 Months Ended
	Jun. 29, 2014	May 21, 2014	Dec. 31, 2013	May 21, 2014 5.25% Senior Notes due 2024	Jun. 29, 2014 5.25% Senior Notes due 2024	Jun. 29, 2014 5.25% Senior Notes due 2024 Minimum	Jun. 29, 2014 5.25% Senior Notes due 2024 Maximum	Jun. 29, 2014 5.25% Senior Notes due 2024 Redemption prior to June 15, 2019	Jun. 29, 2014 5.25% Senior Notes due 2024 Redemption prior to June 15, 2017	Mar. 30, 2014 3.875% Convertible Senior Subordinated Notes	Dec. 31, 2013 3.875% Convertible Senior Subordinated Notes	Jun. 29, 2014 3.875% Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
5.25% Senior Notes due 2024	$ 250,000,000	$ 250,000,000
Debt instrument, stated interest rate	3.875%			5.25%	5.25%						3.875%	3.875%
Debt instrument, interest payment commencing date				Dec. 15, 2014
Debt instrument maturity date	Jul. 16, 2018			Jun. 15, 2024	Jun. 15, 2024							Aug. 01, 2017
Transaction fees				4,700,000
Proceed from senior Notes used to repay revolving line of credit				245,000,000
Percent of redemption price to principal amount any time on or after June 15, 2019					102.625%
Declining percent of redemption price to principal amount on June 15, 2022						0.875%	100.00%
Debt instrument, earliest date of redemption					Jun. 15, 2019
Redemption price percentage								100.00%	105.25%
Make-whole premium as percentage of principal amount of 2024 Notes subject to redemption								1.00%
Basis spread								0.50%
Percent of principal amount of notes redeemable									35.00%
Convertible notes, threshold number of trading days to trigger conversion feature												20 days
Convertible notes, threshold percentage of stock price trigger										130.00%	130.00%
Conversion price, per share										$ 61.32
Convertible notes, stock price trigger										$ 79.72
Total Long-term Debt	$ 1,057,573,000		$ 1,281,587,000