Debt - 6.375% Senior Unsecured Notes Due 2024 - Additional Information (Detail) - 6.375% Senior Unsecured Notes Due 2024 [Member] - Revolving Credit Facility [Member] - USD ($)		12 Months Ended
Feb. 22, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Senior unsecured notes face amount	$ 500,000,000
Senior unsecured notes, maturity date	Mar. 01, 2024
Senior unsecured notes, interest rate	6.375%
Debt instrument, redemption price percentage	106.375%
Senior notes, repurchased price percentage on principal amount plus accrued and unpaid interest	101.00%
Senior unsecured notes, payable term		Interest on the notes is payable on March 1 and September 1 of each year
Senior notes, earliest redemption date	Mar. 01, 2019
Senior unsecured notes, redemption description		we may redeem up to 35% of the notes at a redemption price equal to 106.375% of the aggregate principal amount thereof, plus accrued and unpaid interest thereon, using proceeds from one or more equity offerings. In the event of a change in control, each holder of the notes may require us to repurchase some or all of the notes at a repurchase price equal to 101% of the aggregate principal amount of the notes plus accrued and unpaid interest to the date of purchase.
Maximum [Member]
Debt Instrument [Line Items]
Senior unsecured notes, redemption percentage on principal amount	35.00%

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- Definition

Debt Instrument Repurchase Price Percentage On Principal Amount Plus Accrued And Unpaid Interest

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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Percentage of principal amount of debt redeemed.

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