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Financial Instruments and Concentration of Credit Risks - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Counterparty Credit Concentration Risk [Line Items] |  |  |
Maturity period limit of foreign currency exchange instruments (in months) | 3 months |  |
Net fair value gain (loss) on foreign exchange forward contracts | $ (4.4) | $ 5.3 |
Receivables due from U.S. federal governmental agencies | 99.0 | 94.0 |
Difference between carrying amount and fair value of long-term debt | 3.0 | 9.0 |
Other income (expense), net |  |  |
Counterparty Credit Concentration Risk [Line Items] |  |  |
Gain (loss) on foreign exchange forward contracts | 15.6 | 17.3 | $ (7.3)
Prepaid Expenses and Other Current Assets |  |  |
Counterparty Credit Concentration Risk [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | 2.2 | 6.1 |
Other Accrued Liabilities |  |  |
Counterparty Credit Concentration Risk [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | (6.6) | (0.8) |
Foreign Exchange Contract |  |  |
Counterparty Credit Concentration Risk [Line Items] |  |  |
Notional amount of foreign exchange forward contracts not designated as hedging instruments | $ 940.1 | $ 403.9 |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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