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Special Charges - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Employee | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges recorded | $ 40,885,000 | $ 10,445,000 | $ 0
Charge to be paid in cash | 48,400,000 |  |
Non-cash reduction to expense | 7,500,000 |  |
Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges recorded | $ 23,500,000 |  |
Employee positions eliminated | Employee | 255 |  |
Contract Termination |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges recorded | $ 14,400,000 |  |
Charge to be paid in cash | 22,700,000 |  |
Non-cash reduction to expense | 8,300,000 |  |
Other Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges recorded | 3,000,000 |  |
Non-cash reduction to expense | $ 800,000 |  |

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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