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Business Combinations - Acquisition of Gila LLC and Xtend Healthcare - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2015 | Feb. 28, 2015 | Jun. 30, 2016 | Sep. 30, 2015
Asset Recovery - Gila LLC [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Business acquisition, effective date of acquisition |  |  | Feb. 28, 2015 |
Controlling interest percentage |  | 98.00% |  |
Business acquisition, purchase price |  | $ 185 |  |
Goodwill |  |  |  | $ 97
Business acquisition, indefinite life intangible asset |  |  |  | 13
Business acquisition, definite life intangible assets |  |  |  | $ 71
Asset Recovery - Gila LLC [Member] | Minimum [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Definite life intangible assets, amortization period |  |  |  | 2 years
Asset Recovery - Gila LLC [Member] | Maximum [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Definite life intangible assets, amortization period |  |  |  | 16 years
Asset Recovery - Xtend Healthcare [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Business acquisition, effective date of acquisition |  |  | Oct. 31, 2015 |
Controlling interest percentage | 89.00% |  |  |
Business acquisition, purchase price | $ 164 |  |  |
Goodwill |  |  | $ 102 |
Business acquisition, definite life intangible assets |  |  | $ 65 |
Asset Recovery - Xtend Healthcare [Member] | Minimum [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Definite life intangible assets, amortization period |  |  | 10 years |
Asset Recovery - Xtend Healthcare [Member] | Maximum [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Definite life intangible assets, amortization period |  |  | 15 years |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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