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	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 31, 2015
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 22,495	$ 24,596	$ 22,495	$ 24,596	$ 12,280
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
Interest rate on notes					8.00%
Debt instrument, redemption description				In 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.
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
Interest rate on notes	6.75%			6.75%	6.75%		6.75%
Debt instrument, redemption description				In July 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
Senior Subordinated Notes \| 7.25% Senior Subordinated notes due 2018
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount						103.625%
Announced call for redemption amount of debt						$ 250,000
Interest rate on notes						7.25%