Contractual interest rate for funds borrowed, under the debt agreement.

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Description of debt redemption features under terms of the debt agreement.

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Indebtedness - Senior Subordinated Notes and Early Extinguishment of Debt - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended
	Jul. 01, 2015	May. 27, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	May. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 22,495	$ 0		$ 22,495	$ 24,596
Subordinated Debt
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount						101.00%
Subordinated Debt \| 8.0% Senior Subordinated notes due 2019
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount		104.00%
Announced call for redemption amount of debt		$ 300,000
Loss on early extinguishment of debt					$ 24,600
Debt instrument, redemption description						On May 27, 2014, we announced a call for the redemption of $300.0 million of our outstanding 8.0% senior subordinated notes due 2019 at 104.0% of par plus accrued and unpaid interest, which were redeemed on June 26, 2014.
Interest rate on notes		8.00%
Senior Subordinated Notes \| 6.75% Senior Subordinated Notes Due 2020
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount	103.375%
Announced call for redemption amount of debt	$ 500,000
Loss on early extinguishment of debt			$ 22,500
Debt instrument, redemption description						On July 1, 2015, we announced a call for the redemption of $500.0 million of our outstanding 6.75% senior subordinated notes due 2020 at a price of 103.375% of par plus accrued and unpaid interest, which were redeemed on August 3, 2015. In third quarter 2015, we recognized a loss on early extinguishment of debt of $22.5 million, including transaction call premium costs and the expensing of the remaining deferred financing costs on the repurchased debt
Interest rate on notes			6.75%			6.75%		6.75%	6.75%