Debt - Additional Information (Details)
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12 Months Ended |
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Nov. 15, 2017
USD ($)
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Dec. 31, 2017
USD ($)
letters_of_credit
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Dec. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
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Apr. 19, 2016 |
| Debt Instrument [Line Items] |
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| Payments of debt issuance costs |
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$ 1,844,000
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$ 221,000
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$ 0
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| Amortization expense |
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$ 1,464,000
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1,198,000
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$ 1,130,000
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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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7
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| Letters of credit outstanding |
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$ 12,000,000
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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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| Covenant terms, maximum debt to EBITDA ratio, 12 months following purchase |
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3.25
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| Covenant terms, ratio of combined EBITDA to combined interest expense |
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4.50
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| Ratio of total indebtedness to combined EBITDA |
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1.64
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| Ratio of combined EBITDA to combined interest expense |
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10.14
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| Interest rate |
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4.00%
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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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| Senior secured credit facilities | Line of Credit |
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| Debt Instrument [Line Items] |
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| Amortization expense |
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$ 1,400,000
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| Write off of deferred debt issuance costs |
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800,000
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| Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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79,000,000
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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 |
$ 74,600,000
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| Payments of debt issuance costs |
1,800,000
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| Amortization expense |
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100,000
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$ 1,200,000
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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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108,000,000
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| Quarterly Through September 30, 2019 | Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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1,000,000
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| Quarterly December 31, 2019 | Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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1,500,000
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| Quarterly Fiscal Quarters December 31, 2020 Through September 30, 2021 | Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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2,000,000
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| Quarterly December 31, 2021 Through September 30, 2022 | Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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2,600,000
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| Due November 15, 2022 | Term facility |
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| Debt Instrument [Line Items] |
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| Line of credit |
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$ 47,600,000
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