Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
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Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 40
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Debt - 2023 Senior Notes and Redemption of 2020 Senior Notes (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Apr. 16, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 01, 2015
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 0	$ 33,317,000	$ 0
Senior Notes [Member] \| 5.875% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate of senior notes (as a percent)			5.875%
Senior Notes [Member] \| 7.75% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate of senior notes (as a percent)						7.75%
Unsecured Debt [Member] \| 5.875% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Senior Notes issued amount	$ 350,000,000
Stated interest rate of senior notes (as a percent)	5.875%
Loss on extinguishment of debt		$ 33,300,000
Redemption price (as a percent)	100.00%
Unsecured Debt [Member] \| 7.75% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument purchase price (as a percent)	105.813%