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

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Indebtedness - Senior Subordinated Notes and Early Extinguishment of Debt - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended			0 Months Ended	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 27, 2014	Dec. 31, 2012
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 24,596,000	$ 12,280,000	$ 24,596,000	$ 12,280,000	$ 11,063,000
Subordinated Debt
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount			101.00%
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						300,000,000
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.
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				250,000,000
7.5% Senior Subordinated notes due 2017
Debt Instrument [Line Items]
Maximum redemption price of notes as percentage of principal amount					103.75%
Loss on early extinguishment of debt							$ 11,100,000