Debt - Additional Information (Details)
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3 Months Ended |
9 Months Ended |
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Nov. 15, 2017
USD ($)
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Sep. 28, 2018
USD ($)
letters_of_credit
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Sep. 29, 2017
USD ($)
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Sep. 28, 2018
USD ($)
letters_of_credit
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Sep. 29, 2017
USD ($)
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Dec. 31, 2017
USD ($)
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| Debt Instrument [Line Items] |
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| Debt financing fees |
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$ 1,471,000
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$ 1,471,000
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$ 1,789,000
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| Amortization expense |
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$ 318,000
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$ 561,000
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| Letters of credit |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum borrowing capacity |
$ 25,000,000
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| Number of letters of credit outstanding | letters_of_credit |
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6
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6
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| Letters of credit outstanding |
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$ 10,200,000
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$ 10,200,000
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| Senior secured credit facilities |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum borrowing capacity |
200,000,000
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| Maximum allowed dividend distribution |
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$ 10,000,000
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| Covenant terms, ratio of total indebtedness to combined EBITDA |
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3.00
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3.00
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| Covenant terms, maximum debt to EBITDA ratio, twelve months following purchase |
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3.25
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3.25
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| Covenant terms, ratio of EBITDA to interest expense, net, |
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4.50
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4.50
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| Ratio of total indebtedness to combined EBITDA |
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1.29
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| Ratio of combined EBITDA to combined interest expense |
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11.40
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| Interest rate |
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4.25%
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4.25%
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| Senior secured credit facilities | Minimum |
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| Debt Instrument [Line Items] |
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| Undrawn portion of revolving facility, commitment fee percentage |
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0.30%
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| Senior secured credit facilities | Maximum |
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| Debt Instrument [Line Items] |
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| Undrawn portion of revolving facility, commitment fee percentage |
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0.45%
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| Senior secured credit facilities | London Interbank Offered Rate (LIBOR) | Minimum |
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| Debt Instrument [Line Items] |
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| Spread on variable rate |
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1.75%
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| Senior secured credit facilities | London Interbank Offered Rate (LIBOR) | Maximum |
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| Debt Instrument [Line Items] |
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| Spread on variable rate |
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2.50%
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| Senior secured credit facilities | Base Rate | Minimum |
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| Debt Instrument [Line Items] |
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| Spread on variable rate |
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0.75%
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| Senior secured credit facilities | Base Rate | Maximum |
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| Debt Instrument [Line Items] |
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| Spread on variable rate |
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1.50%
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| Term facility |
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| Debt Instrument [Line Items] |
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| Term facility, amortization rate, year one |
1,000,000
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| Term facility, amortization rate, year two |
1,500,000
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| Term facility, amortization rate, year three |
2,000,000
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| Term facility, amortization rate, year four |
2,600,000
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| Term facility, amortization rate, year five |
47,600,000
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| Balance outstanding |
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$ 76,000,000
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$ 76,000,000
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| Term facility | Line of Credit |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum borrowing capacity |
$ 80,000,000
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| Debt instrument, term |
5 years
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| Distribution to subsidiary of Exelis |
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74,600,000
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| Debt financing fees |
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1,800,000
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1,800,000
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| Amortization expense |
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100,000
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$ 200,000
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300,000
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$ 600,000
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| Revolver |
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| Debt Instrument [Line Items] |
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| Balance outstanding |
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0
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0
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| Revolver | Line of Credit |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum borrowing capacity |
$ 120,000,000
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| Debt instrument, term |
5 years
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| Available borrowing capacity |
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$ 109,800,000
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$ 109,800,000
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