Debt - 6.375% Senior Unsecured Notes Due 2022 - Additional Information (Detail) - 6.375% Senior Unsecured Notes Due 2022 [Member] - USD ($)	Oct. 07, 2017	Aug. 20, 2013	Feb. 17, 2012
Debt Instrument [Line Items]
Senior unsecured notes face amount		$ 150,000,000	$ 200,000,000
Senior unsecured notes, interest rate			6.375%
Senior unsecured notes, maturity date			Feb. 15, 2022
Debt instrument redemption price		102.00%
Debt instrument effective rate		5.998%
Redemption Premium	$ 11,200,000

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

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

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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

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

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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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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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No definition available.

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