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Interest Expense, Net - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Investment Income [Line Items] |  |  |
Capitalized borrowing cost | $ 0 | $ 0 | $ 0
Senior Unsecured Convertible Debt [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Interest expense | 24,000,000 |  |
Non-cash interest expense accretion of discount on liability component | $ 20,000,000 |  |
Issued date of senior unsecured convertible bonds | Jul. 31, 2014 |  |
Floating Rate Notes [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Interest income (expense), net | $ 6,000,000 | $ 2,000,000 |
Floating Rate Notes [Member] | Maximum [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Interest income (expense), net |  |  | $ 1,000,000

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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