Borrowings - Additional Information (Detail) (USD $)	12 Months Ended				0 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	May 21, 2014	Sep. 28, 2014	Jul. 16, 2013	Dec. 31, 2013	Sep. 29, 2013	Jun. 13, 2011	Aug. 09, 2010
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 0	$ (1,250,000)	$ 0
Interest rate	3.875%	3.875%	3.875%					3.875%
Convertible notes, latest date of termination	Jul. 28, 2017
Convertible note hedge transactions, purchased call options	88,000,000
Convertible note hedge transactions, net of tax	56,000,000
Conversion of convertible notes, shares issued upon conversion	1,900,000	600,000		7,981,422
Warrants expiration period				180 days
Warrants expiration date				Nov. 01, 2017
Strike price of warrants	$ 74.65			$ 74.65
Proceeds from sale of warrants				59,400,000
Convertible debt, fair value	316,300,000
Proceeds from Convertible Debt	400,000,000
Initial equity component	83,700,000
Convertible notes, carrying value, net of tax	53,300,000
Debt discount	83,700,000
Remaining life of the convertible notes	2 years 7 months 6 days
Effective interest rate	7.814%
Ownership percentage of subsidiaries	50.00%
Debt Instrument, Basis Spread on Variable Rate	50.00%
Total Long-term Debt	1,068,401,000	1,286,287,000						1,286,287,000
5.25% Senior Subordinated Notes Due 2024
Debt Instrument [Line Items]
Repayment of Debt					245,000,000
Interest rate	5.25%	5.25%						5.25%
Senior notes	250,000,000	0						0
Senior Notes
Debt Instrument [Line Items]
Interest rate					5.25%
Senior notes					250,000,000
Fee amount					4,500,000
Proceed from senior notes used to repay revolving line of credit					245,000,000
Ownership percentage of subsidiaries	100.00%
Senior Notes | Minimum
Debt Instrument [Line Items]
Declining percent of redemption price to principal amount	0.875%
Senior Notes | Maximum
Debt Instrument [Line Items]
Percent of redemption price to principal amount	102.625%
Declining percent of redemption price to principal amount						100.00%
Senior Notes | Debt Instrument Redemption Prior To June 15, 2019
Debt Instrument [Line Items]
Percent of redemption price to principal amount on redemption	100.00%
Make whole premium as percentage of principal amount of notes subject to redemption						1.00%
Senior Notes | Debt Instrument Redemption Prior To June Fifteen Twenty Seventeen
Debt Instrument [Line Items]
Percent of redemption price to principal amount on redemption	105.25%
Percent of principal amount of notes redeemable	35.00%
Senior Credit Facility
Debt Instrument [Line Items]
Maximum amount available for borrowing							775,000,000
Senior Credit Facility | Term Loan
Debt Instrument [Line Items]
Maximum amount available for borrowing							375,000,000		375,000,000
Senior Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum amount available for borrowing							400,000,000
New Senior Credit Facility
Debt Instrument [Line Items]
Maximum amount available for borrowing	850,000,000						850,000,000
Transaction fees recorded as Deferred asset		6,400,000
Amortization of debt issuance costs									1,300,000
Borrowing under revolving credit							382,000,000	298,000,000
Federal funds effective rate plus							0.50%
Prime rate or one month LIBOR plus							1.00%
Senior credit facility interest rate	1.92%
New Senior Credit Facility | Prime Rate | Minimum
Debt Instrument [Line Items]
Applicable margin							0.25%
New Senior Credit Facility | Prime Rate | Maximum
Debt Instrument [Line Items]
Applicable margin							1.00%
New Senior Credit Facility | Libor Rate Plus
Debt Instrument [Line Items]
Senior credit facility interest rate	0.17%
New Senior Credit Facility | Libor Rate Plus | Minimum
Debt Instrument [Line Items]
Applicable margin							1.25%
New Senior Credit Facility | Libor Rate Plus | Maximum
Debt Instrument [Line Items]
Applicable margin							2.00%
New Senior Credit Facility | Rate Spread
Debt Instrument [Line Items]
Senior credit facility interest rate	1.75%
Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit facility amount outstanding	6,000,000
3.875% Convertible Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	3.875%	3.875%						3.875%			3.875%
Convertible subordinated debt	399,898,000	400,000,000						400,000,000			400,000,000
Number of trading days	20 days
Number of consecutive trading days	30 days
Percentage of conversion price of applicable trading day	130.00%
Number of business days	5 days
Principal amount of convertible notes	1,000
Percentage of the product of the last reported sale price of the common stock	98.00%
Convertible notes conversion rate	16.3084
Conversion price, per share	$ 61.32
6.875% Senior Subordinated Notes Due 2019
Debt Instrument [Line Items]
Interest rate	6.875%	6.875%						6.875%		6.875%
Senior subordinated notes	250,000,000	250,000,000						250,000,000		250,000,000
Debt instrument maturity date	2019	2019								2019
Percent of redemption price to principal amount	103.438%
Declining percent of redemption price to principal amount	1.719%
Debt instrument, earliest date of redemption	Jun. 01, 2015
Percent of redemption price to principal amount on redemption	100.00%
Make-whole premium as percentage of principal amount of Notes subject to redemption	1.00%
Debt Instrument, Basis Spread on Variable Rate	0.50%
6.875% Senior Subordinated Notes Due 2019 | Minimum
Debt Instrument [Line Items]
Percent of redemption price to principal amount	100.00%
Securitization Program
Debt Instrument [Line Items]
Maximum amount available for borrowing	45,300,000.0
Other Short-term Borrowings	4,700,000	4,700,000						4,700,000
Interest rate	0.92%	0.92%						0.92%
Maximum amount available under receivable securitization	$ 50,000,000.0