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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 9 Months Ended |  | 12 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended |
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Sep. 28, 2014 | Sep. 29, 2013 | Dec. 31, 2013 | Dec. 31, 2013 Trapeze [Member] | Dec. 31, 2010 Trapeze [Member] | Sep. 28, 2014 Trapeze [Member] | Sep. 28, 2014 Thermax and Raydex [Member] | Dec. 31, 2012 Thermax and Raydex [Member] | Sep. 28, 2014 First Quarter Fiscal Year 2014 [Member] | Sep. 28, 2014 Fiscal Second Quarter 2014 [Member] | Sep. 28, 2014 Fiscal Third Quarter 2014 [Member] | Sep. 28, 2014 Standby letters of credit [Member] | Sep. 28, 2014 Bank guaranties [Member] | Sep. 28, 2014 Surety bonds [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reporting period | 271 days | 272 days |  |  |  |  |  |  | 89 days | 91 days | 91 days |  |  |
Guideline used to determine the end date of first quarter |  |  |  |  |  |  |  |  | 91 days |  |  |  |  |
Fair value measurements, transfers between Level 1 and Level 2 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Original maturity period of cash and cash equivalents | Three months or less |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of cash and cash equivalents based on quoted market prices in active markets Level 1 valuation | 132,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit, bank guaranties and surety bonds |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 | 2,200,000 | 1,700,000
Cash proceeds from the sales of discontinued operations |  |  |  |  | 136,900,000 |  |  | 265,600,000 |  |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, before tax |  |  |  |  | 88,300,000 |  | (900,000) | 211,600,000 |  |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, net of tax | (562,000) |  |  |  | 44,800,000 |  | (600,000) | 124,700,000 |  |  |  |  |  |
Sale price for business |  |  |  |  | 152,100,000 |  |  |  |  |  |  |  |  |
Amount in escrow as partial security for Company's indemnity obligations under transaction's purchase and sale agreement |  |  |  |  | 15,200,000 |  |  |  |  |  |  |  |  |
Receivables, net | 416,412,000 |  | 304,204,000 |  |  | 3,800,000 |  |  |  |  |  |  |  |
Partial settlement received from escrow |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |

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