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Senior Notes and Unsecured Revolving Credit Facility - Schedule of Senior Notes (Phantoms) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	May 31, 2016
4.375% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Maturity date of senior note	Jun. 15, 2019
5.875% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Maturity date of senior note	Jun. 15, 2024
Senior Notes [Member] | 4.375% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Interest rate on senior note (percent)		4.375%	4.375%
Maturity date of senior note		Jun. 15, 2019	Jun. 15, 2019
Senior Notes [Member] | 4.875% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on senior note (percent)		4.875%	4.875%	4.875%
Maturity date of senior note		Jul. 01, 2021	Jul. 01, 2021
Senior Notes [Member] | 5.875% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate on senior note (percent)		5.875%	5.875%
Maturity date of senior note		Jun. 15, 2024	Jun. 15, 2024

X

- 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
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

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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
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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