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Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Position
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs paid during the period |  | $ 800 |
Employee termination costs |  |  | $ 1,300
Number of positions eliminated | Position |  |  | 30
Amounts paid during the period | $ 1,285 | 1,432 |
Restructuring charges | 5,945 | 4,559 | $ 1,045
Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance liability to be paid over the next 12 months | 0 | 0 | 800
Amounts paid during the period |  | 778 | 2,900
Restructuring charges |  |  | 777
Facility Closures [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Amounts paid during the period | 1,285 | 654 |
Restructuring charges | 5,945 | 4,559 | $ 268
Facility Closures [Member] | Other Current Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 1,800 |  |
Facility Closures [Member] | Other Noncurrent Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 4,100 |  |
General and Administrative Expense [Member] | Lleased Facilities in Edison, NJ; Chantilly, VA; Charlotte, SC; Parsippany, PA; 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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