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Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Facility Closures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 5,945 | $ 4,559 | $ 4,127
Facility Closures [Member] | Other Current Liabilities [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | 1,600
Facility Closures [Member] | Other Noncurrent Liabilities [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | $ 2,500
General and Administrative Expense [Member] | Leased Facilities in Edison, NJ; Chantilly, VA; Charlotte, NC; Parsippany, NJ; and Waltham, MA [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Lease termination fee | $ 2,400 |  |
General and Administrative Expense [Member] | Leased Facilities in Watford, UK; Providence, RI; Chantilly, VA; and West Hills, CA [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Lease termination fee |  | $ 5,000 |

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