Debt Arrangements - Additional Information (Detail)										1 Months Ended			3 Months Ended		12 Months Ended					63 Months Ended
		Apr. 04, 2016 USD ($)	Mar. 07, 2016 USD ($)	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 ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 USD ($) shares	Dec. 31, 2011 USD ($) shares	Mar. 31, 2016 USD ($) shares	Apr. 30, 2016	Jan. 27, 2016	Jun. 21, 2013 USD ($)
Debt Instrument [Line Items]
Payments of securitized financing transaction													$ 9,430,000
Payment for the acquisition of Brand													144,000	$ 46,000
Payment of long-term debt													15,282,000	15,281,000
Current portion of long-term debt													61,123,000		$ 61,123,000					$ 61,123,000
Restricted cash													40,663,000		49,544,000					40,663,000
Long term debt	[1]												1,443,245,000		$ 1,449,392,000					$ 1,443,245,000
Non cash additional interest expense on convertible notes													7,983,000	7,516,000
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
Subsequent Event
Debt Instrument [Line Items]
Net proceeds received from issuance of debt		$ 265,100,000
Minimum
Debt Instrument [Line Items]
Equity ownership percentage																						20.00%
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%
IBG Borrower
Debt Instrument [Line Items]
Equity ownership percentage			35.00%
Termination of license generating with minimum royalty guarantees													$ 5,000,000							5,000,000
Premium percentage of aggregate principal amount first two years loan			3.00%
Premium percentage of aggregate principal amount third year loan			3.00%
Premium percentage of aggregate principal amount fourth year loan			1.00%
IBG Borrower | Minimum
Debt Instrument [Line Items]
Asset coverage ratio, minimum			1.25%
IBG Borrower | Maximum
Debt Instrument [Line Items]
Leverage ratio			4.50%
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													$ 797,600,000		812,900,000					797,600,000
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
Restricted cash													40,700,000		49,500,000					40,700,000
Cash interest expense for convertible notes													8,500,000	$ 8,300,000
Long term debt													697,626,000		$ 712,907,000					697,626,000
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
Debt instrument, interest rate, stated percentage				1.50%									1.50%	1.50%	1.50%					1.50%
Net proceeds received from issuance of debt				$ 390,600,000
Cash interest expense for convertible notes													$ 3,000,000	$ 3,000,000
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													$ 361,873,000		$ 357,453,000					$ 361,873,000
Non cash additional interest expense on convertible notes													4,100,000	$ 3,900,000
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 | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		1.50%
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								$ 11,500,000		$ 13,000,000					11,500,000
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
Debt instrument, interest rate, stated percentage								2.50%					2.50%	2.50%	2.50%					2.50%
Net proceeds received from issuance of debt								$ 291,600,000
Debt instrument, Maturity Date													2016-06
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													$ 297,612,000		$ 294,048,000					$ 297,612,000
Non cash additional interest expense on convertible notes													$ 3,300,000	$ 3,000,000
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 | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		2.50%																			2.50%
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					$ 800,000		$ 1,800,000					$ 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%
Senior Secured Term Loan
Debt Instrument [Line Items]
Principal amount of long term debt			$ 300,000,000
Debt instrument, maturity date			Mar. 07, 2021
Margin applied to LIBOR			10.00%
Percentage of principal debt amortization			5.00%
Asset coverage ratio, minimum			165.00%
Interest rate increase additional per annum			3.00%
Payment of unpaid principal and accrued interest of lenders			50.00%
Senior Secured Term Loan | Subsequent Event
Debt Instrument [Line Items]
Net proceeds received from issuance of debt		$ 265,100,000
Senior Secured Term Loan | LIBOR
Debt Instrument [Line Items]
LIBOR floor			1.50%
Senior Secured Term Loan | IBG Borrower
Debt Instrument [Line Items]
Principals of debt amortization terms													Borrowings under the Senior Secured Term Loan amortize yearly at 5% of principal as long as the applicable asset coverage ratio, as defined in the Credit Agreement, remains greater than or equal to 1.65:1.00 as of the end of each fiscal quarter and IBG Borrower timely delivers a compliance certificate to Cortland after each fiscal quarter. If IBG Borrower’s asset coverage ratio measured as of the end of a certain fiscal quarter is 1.25:1.00 or greater but less than 1.45:1.00, or 1.45:1.00 or greater but less than 1.65:1.00, IBG Borrower will be obligated to pay during the subsequent quarter amortization at 25% per annum, or 15% per annum, respectively. IBG Borrower will also pay amortization at 25% per annum if it fails to timely deliver a compliance certificate to Cortland after each fiscal quarter
Percentage of principal debt amortization on default			25.00%
Senior Secured Term Loan | IBG Borrower | 1.20:1.00 or greater but less than 1.45:1.00
Debt Instrument [Line Items]
Percentage of principal debt amortization			25.00%
Asset coverage ratio, minimum			1.25%
Asset coverage ratio, maximum			1.45%
Senior Secured Term Loan | IBG Borrower | 1.45:1.00 or greater but less than 1.65:1.00
Debt Instrument [Line Items]
Percentage of principal debt amortization			15.00%
Asset coverage ratio, minimum			1.45%
Asset coverage ratio, maximum			1.65%

[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.