Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Debt Instrument Earliest Date Of Redemption

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- Definition

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

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- Definition

Interest rate of interest rate derivative instrument.

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- Definition

Maturity date of interest rate swap

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No definition available.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

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.

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No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02.22(a)(2))
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- Definition

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

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- Definition

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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No definition available.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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No definition available.

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Debt - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended
Debt - Additional Information (Detail) - USD ($)	Feb. 22, 2016	Oct. 31, 2011	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2010
2016 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, interest rate			6.375%
2006 Senior Unsecured Notes [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Portion of debt instrument face amount					$ 65,000,000
2006 Senior Unsecured Notes [Member] \| Interest Rate Contract [Member]
Debt Instrument [Line Items]
Fair value of the interest rate swaps			$ 2,100,000	$ 2,900,000
2006 Senior Unsecured Notes [Member] \| Interest Rate Contract One [Member]
Debt Instrument [Line Items]
Interest rate of interest rate derivative instrument					5.507%
Maturity date of interest rate swap			2016-07
2006 Senior Unsecured Notes [Member] \| Interest Rate Contract Two [Member]
Debt Instrument [Line Items]
Maturity date of interest rate swap			2016-07
Interest rate swap, amount fixed		$ 60,000,000
Interest rate of derivative instrument		5.675%
Revolving Credit Facility [Member] \| 2016 Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Portion of debt instrument 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 will be payable on March 1 and September 1 of each year
Senior unsecured notes commencing date of payment	Sep. 01, 2016
Senior notes, earliest redemption date	Mar. 01, 2019
Senior unsecured notes, redemption description	We may redeem some or all of the notes at any time prior to March 1, 2019 at a “make whole” redemption price. On or after March 1, 2019, we may redeem some or all of the nates at a premium that will decrease over time. In addition, at any time prior to March 1, 2019, 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.
Revolving Credit Facility [Member] \| 2016 Senior Unsecured Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior unsecured notes, redemption percentage on principal amount	35.00%