Other Noncurrent Assets - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Other Assets, Noncurrent [Abstract]
Proceeds from sale of company-owned life insurance policies	$ 223,000,000	$ 234,000,000
Gain or loss recognized on sale of company-owned life insurance policies			$ 0
Cash surrender value of life insurance			$ 25,000,000	$ 492,000,000

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant