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Long-Term Debt 2029 Senior Notes (Narrative) (Detail) - Senior notes - Senior Notes due 2029 [Member] - USD ($) $ in Thousands		6 Months Ended
	Apr. 16, 2019	Jun. 30, 2019
Aggregate principal amount	$ 500,000
Interest rate	3.50%	3.50%
Maturity date	May 01, 2029
Debt Instrument, Covenant Compliance		As of June 30, 2019, the Company was in compliance with all applicable covenants in the Indenture.
Minimum [Member]
Debt instrument, redemption price, percentage		100.00%
Maximum [Member]
Debt instrument, redemption price, percentage		101.00%

X

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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-Name Accounting Standards Codification
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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