Debt Arrangements - Additional Information (Detail)							1 Months Ended			3 Months Ended				9 Months Ended			12 Months Ended				57 Months Ended
	Mar. 18, 2013 USD ($) d $ / shares shares	Mar. 13, 2013 USD ($) $ / shares shares	Mar. 12, 2013 $ / shares	Nov. 29, 2012 USD ($)	May. 23, 2011 USD ($) d $ / shares shares	May. 17, 2011 $ / shares	Feb. 28, 2015 USD ($)	Jul. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) $ / shares		Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) $ / shares shares		Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 USD ($) shares	Dec. 31, 2011 USD ($) shares	Sep. 30, 2015 USD ($) $ / shares shares		Jun. 21, 2013 USD ($)
Debt Instrument [Line Items]
Payment for the acquisition of Brand														$ 120,000		$ 790,000
Payment of long-term debt														45,843,000		47,574,000
Current portion of long-term debt										$ 351,544,000				351,544,000			$ 61,123,000				$ 351,544,000
Restricted cash										51,911,000				51,911,000			59,560,000				51,911,000
Long term debt										$ 1,471,642,000				1,471,642,000			$ 1,394,077,000				$ 1,471,642,000
Non cash additional interest expense on convertible notes														$ 23,408,000		$ 22,041,000
Number of shares repurchased | shares														360,000			4,994,578	15,812,566	7,185,257	1,150,000	29,502,401
Cost of shares repurchased														$ 12,391,000			$ 193,434,000	$ 436,419,000	$ 125,341,000	$ 19,138,000	$ 786,723,000
Sold warrants, shares of common stock strike price per share | $ / shares										$ 6.65				$ 6.65			$ 6.65				$ 6.65
MG Icon
Debt Instrument [Line Items]
Equity ownership percentage				50.00%
Peanuts Worldwide
Debt Instrument [Line Items]
Joint venture ownership percentage				80.00%
Hardy Way
Debt Instrument [Line Items]
Joint venture ownership percentage				85.00%
Zoo York brand
Debt Instrument [Line Items]
Ownership Percentage				100.00%
Ice Cream Trademarks
Debt Instrument [Line Items]
Equity ownership percentage																							50.00%
2012 Senior Secured Notes
Debt Instrument [Line Items]
Principal amount of long term debt				$ 600,000,000
Debt instrument, interest rate, stated percentage				4.229%
Debt instrument, quarterly payment				$ 10,500,000
Debt instrument, frequency of payment														quarterly
Excess interest rate on original interest rate				3.40%
Proceeds from issuance of debt instrument				$ 150,400,000
Payments of securitized financing transaction				20,900,000
2012 Senior Secured Notes | Umbro
Debt Instrument [Line Items]
Payment for the acquisition of Brand				218,300,000
Class A Variable Funding Note
Debt Instrument [Line Items]
Principal amount of long term debt				100,000,000
Variable Funding Notes
Debt Instrument [Line Items]
Net proceeds received from issuance of debt							$ 100,000,000
Commitment fee on the unused portion of the variable funding notes facility							0.50%
Debt Instrument anticipated repayment year and month							2018-01
Additional interest rate							5.00%
Long term debt										$ 100,000,000				$ 100,000,000							$ 100,000,000
2013 Senior Secured Notes
Debt Instrument [Line Items]
Principal amount of long term debt																							$ 275,000,000
Debt instrument, interest rate, stated percentage																							4.352%
Debt instrument, quarterly payment				$ 4,800,000
Debt instrument, frequency of payment														quarterly
Excess interest rate on original interest rate				3.14%
Payments of securitized financing transaction				$ 7,200,000
Senior Secured Notes
Debt Instrument [Line Items]
Principal amount of long term debt										828,200,000				$ 828,200,000			$ 774,000,000				828,200,000
Debt Instrument anticipated repayment year and month				2020-01
Additional interest rate				5.00%
Debt instrument, Maturity Date				2043-01
Debt instrument description of interest														If the Co-Issuers have not repaid or refinanced the Senior Secured Notes prior to the anticipated repayment date, additional interest will accrue on the Senior Secured Notes equal to the greater of (A) 5% per annum and (B) a per annum interest rate equal to the excess, if any, by which the sum of (i) the yield to maturity (adjusted to a quarterly bond-equivalent basis), on the anticipated repayment date of the United States treasury security having a term closest to 10 years plus (ii) 5% plus (iii) with respect to the 2012 Senior Secured Notes, 3.4%, or with respect to the 2013 Senior Secured Notes, 3.14%, exceeds the original interest rate.
Anticipated repayment date				10 years
Payment of long-term debt								$ 1,600,000
Current portion of long-term debt										61,100,000				$ 61,100,000			61,100,000				61,100,000
Restricted cash										51,900,000				51,900,000			59,600,000				51,900,000
Long term debt										728,189,000				728,189,000			$ 774,030,000				728,189,000
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018
Debt Instrument [Line Items]
Principal amount of long term debt	$ 400,000,000									$ 400,000,000				$ 400,000,000							$ 400,000,000
Debt instrument, interest rate, stated percentage	1.50%									1.50%			1.50%	1.50%		1.50%	1.50%				1.50%
Net proceeds received from issuance of debt	$ 390,600,000
Debt instrument, maturity date	Mar. 15, 2018
Debt instrument, payment terms														The 1.50% Convertible Notes bear interest at an annual rate of 1.50%, payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2013
Debt instrument, effective interest rate	6.50%
Debt instrument, conversion rate	32.4052
Principal amount of each convertible note	$ 1,000
Convertible notes, initial conversion price per share | $ / shares	$ 30.86
Long term debt										$ 353,032,000	[1]			$ 353,032,000	[1]		$ 339,943,000				$ 353,032,000	[1]
Non cash additional interest expense on convertible notes										4,600,000			$ 3,900,000	12,400,000		$ 11,400,000
Cash interest expense for convertible notes										1,500,000			$ 1,500,000	4,500,000		$ 4,500,000
Number of shares repurchased | shares	2,964,000
Cost of shares repurchased	$ 69,000,000
Sold warrants, shares of common stock | shares		13,000,000
Sold warrants, shares of common stock strike price per share | $ / shares		$ 35.5173
Sold warrants, shares of common stock exercise date		Jun. 18, 2018
Sold warrants, shares of common stock expiring date		Sep. 01, 2018
Proceeds received from sale of sold warrants		$ 57,700,000
Adjustments to additional paid in capital due convertible note hedge and warrants									$ 3,000,000
Convertible notes, warrant strike price | $ / shares			$ 35.5173
Percentage of premiums			52.50%
Selling price per share of common stock | $ / shares			$ 23.29
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018 | Long | Call Option
Debt Instrument [Line Items]
Convertible notes, common stock option shares | shares	13,000,000
Payment for the purchased call option		84,100,000
Deferred income tax related to convertible notes		$ 29,400,000								14,500,000				$ 14,500,000			$ 18,900,000				14,500,000
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018 | Scenario 1
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days | d	20
Debt instrument, convertible, threshold consecutive trading days	30 days
Debt Instrument, Redemption Price, Percentage														100.00%
Debt Instrument, Redemption, Description														price equal to 100% of the principal amount of the 1.50% Convertible Notes, plus accrued and unpaid interest, if any
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018 | Scenario 2
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days | d	5
Debt instrument, convertible, threshold consecutive trading days	5 days
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018 | Minimum
Debt Instrument [Line Items]
Percentage of closing price to trigger debt conversion	130.00%
Convertible Notes | 1.50% Senior Subordinated Notes Due March 15, 2018 | Maximum
Debt Instrument [Line Items]
Percentage of closing price to trigger debt conversion	98.00%
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016
Debt Instrument [Line Items]
Principal amount of long term debt					$ 300,000,000					$ 300,000,000				$ 300,000,000							$ 300,000,000
Debt instrument, interest rate, stated percentage					2.50%					2.50%			2.50%	2.50%		2.50%	2.50%				2.50%
Net proceeds received from issuance of debt					$ 291,600,000
Debt instrument, payment terms														The 2.50% Convertible Notes bear interest at an annual rate of 2.50%, payable semi-annually in arrears on June 1 and December 1 of each year, beginning December 1, 2011.
Debt instrument, effective interest rate					7.25%
Debt instrument, conversion rate					32.5169
Principal amount of each convertible note					$ 1,000
Convertible notes, initial conversion price per share | $ / shares					$ 30.75
Long term debt										$ 290,421,000	[2]			$ 290,421,000	[2]		$ 280,104,000				$ 290,421,000	[2]
Non cash additional interest expense on convertible notes										3,300,000			$ 3,100,000	9,400,000		$ 8,800,000
Cash interest expense for convertible notes												$ 1,900,000	$ 1,900,000	$ 5,600,000		$ 5,600,000
Sold warrants, shares of common stock | shares					9,760,000
Sold warrants, shares of common stock strike price per share | $ / shares					$ 40.6175
Sold warrants, shares of common stock exercise date					Sep. 01, 2016
Sold warrants, shares of common stock expiring date					Dec. 31, 2016
Proceeds received from sale of sold warrants					$ 28,800,000
Adjustments to additional paid in capital due convertible note hedge and warrants					$ (9,400,000)
Convertible notes, warrant strike price | $ / shares						$ 40.6175
Percentage of premiums						75.00%
Selling price per share of common stock | $ / shares						$ 23.21
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Semi Annual Payment, First Payment
Debt Instrument [Line Items]
Debt instrument, interest payment period														--06-01
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Semi Annual Payment, Second Payment
Debt Instrument [Line Items]
Debt instrument, interest payment period														--12-01
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Long | Call Option
Debt Instrument [Line Items]
Convertible notes, common stock option shares | shares					9,800,000
Payment for the purchased call option					$ 58,700,000
Deferred income tax related to convertible notes					$ 20,600,000					$ 2,800,000				$ 2,800,000			$ 5,900,000				$ 2,800,000
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Scenario 1
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days | d					20
Debt instrument, convertible, threshold consecutive trading days					30 days
Debt Instrument, Redemption Price, Percentage														100.00%
Debt Instrument, Redemption, Description														price equal to 100% of the principal amount of the 2.50% Convertible Notes, plus accrued and unpaid interest, if any.
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Scenario 2
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days | d					5
Debt instrument, convertible, threshold consecutive trading days					5 days
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Minimum
Debt Instrument [Line Items]
Percentage of closing price to trigger debt conversion					130.00%
Convertible Notes | 2.50% Senior Subordinated Notes Due June 2016 | Maximum
Debt Instrument [Line Items]
Percentage of closing price to trigger debt conversion					98.00%

[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of September 30, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 1.50% Convertible Notes is $400.0 million.

[2] Reflects the net debt carrying amount of the 2.50% Convertible Notes in the consolidated balance sheet as of September 30, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 2.50% Convertible Notes is $300.0 million.