Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2018
Accounting Policies and General Information [Line Items]
Cumulative effect, net of tax			$ 2,142
Accounting Standards Update 2014-09 [Member]
Accounting Policies and General Information [Line Items]
Cumulative effect, net of tax	$ 2,100	$ (800)
Accounting Standards Update 2017-12 [Member]
Accounting Policies and General Information [Line Items]
Adjustment to retained earnings and accumulated other comprehensive income to reclassify cash flow hedge	$ 100