The effective date of a duly executed litigation settlement agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Subsequent Events - Additional Information (Detail) - False Claims Act [Member] - Subsequent Event [Member] - USD ($) $ in Millions	Feb. 16, 2017	Feb. 15, 2017
Subsequent Event [Line Items]
Settlement agreement date		February 15, 2017
Case dismissal date	Feb. 16, 2017
United States [Member]
Subsequent Event [Line Items]
Litigation settlement amount		$ 10
Relators Claims for Attorney’s Fees and Costs [Member]
Subsequent Event [Line Items]
Litigation settlement amount		$ 22