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New Accounting Pronouncements (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 2,425,832		$ 2,191,059
Accounting Standards Update 2014-09 | Adjustment Due to Adoption of New Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ (1,800)

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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(30)(a)(3))
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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