Borrowings - Additional Information (Detail) (USD $)	12 Months Ended								1 Months Ended	3 Months Ended	1 Months Ended						12 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2013 Securitization Program	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	Dec. 31, 2013 New Senior Credit Facility	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 Prime Rate Minimum	Jul. 16, 2013 New Senior Credit Facility Prime Rate Maximum	Dec. 31, 2013 3.875% Convertible Senior Subordinated Notes	Dec. 31, 2012 3.875% Convertible Senior Subordinated Notes	Jun. 13, 2011 6.875% Senior Subordinated Notes Due 2019	Jul. 01, 2012 6.875% Senior Subordinated Notes Due 2019	Dec. 31, 2013 6.875% Senior Subordinated Notes Due 2019	Dec. 31, 2012 6.875% Senior Subordinated Notes Due 2019
Debt Instrument [Line Items]
Maximum amount available for borrowing					$ 43,900,000	$ 775,000,000	$ 375,000,000	$ 400,000,000	$ 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%
Applicable margin												1.25%	2.00%		0.25%	1.00%
Senior credit facility interest rate									1.92%		0.17%			1.75%
Principal amount of convertible notes	400,000,000			400,000,000
Interest rate	3.875%																3.875%	3.875%	6.875%		6.875%	6.875%
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
Convertible note hedge transactions, purchased call options	88,000,000
Convertible note hedge transactions, net of tax	56,000,000
Convertible notes, latest date of termination	Jul. 28, 2017
Conversion of convertible notes, shares issued upon conversion	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
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	3 years 7 months 6 days
Effective interest rate	7.814%
6.875% Senior Subordinated Notes due 2019																			250,000,000		250,000,000	250,000,000
Debt instrument maturity date																			2019		2019	2019
Transaction fees																			3,700,000
Repayment of Debt																			125,000,000
Write-off of debt issuance costs																				800,000
Percent of redemption price to principal amount any time on or after June 1, 2015																					103.438%
Debt instrument, earliest date of redemption																					Jun. 01, 2015
Declining percent of redemption price to principal amount on June1, 2017																					100.00%
Percent of redemption price to principal amount on redemption at any time prior to June 1, 2015																					100.00%
Make-whole premium as percentage of principal amount of Notes subject to redemption																					1.00%
Percent of principal amount of notes redeemable																					35.00%
Percent of redemption price of the principal amount of the notes redeemed, plus accrued and unpaid interest																					106.875%
Basis spread																					0.50%
Notional amount		350,000,000
Interest rate swap liability position		14,800,000
Accrued interest		3,100,000
Total Long-term Debt	1,281,587,000			965,280,000
Maximum amount available under receivable securitization	50,000,000
Outstanding borrowings under accounts receivable securitization facility	$ 4,700,000			$ 4,700,000