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Long-Term Debt - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 28, 2016 USD ($) | Dec. 14, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 268,800,000 | $ 131,600,000 |  |  |
Finance cost capitalized | 2,700,000 | 1,500,000 | $ 2,600,000 |  |
Amortization of deferred finance costs | $ 400,000 | $ 1,200,000 | 700,000 |  |
Maximum ratio of net debt to EBITDA | 3.0 |  |  |  |
Minimum ratio of EBITDA to net interest | 4.0 |  |  |  |
Weighted average rate of interest on borrowings | 1.72% | 1.67% |  |  |
Payments of interest on long-term debt | $ 2,600,000 | $ 2,300,000 | 2,300,000 |  |
Net cash outflows in respect of refinancing costs | 1,200,000 | 1,500,000 | $ 100,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 161,000,000 | 133,000,000 |  |  |
Finance cost capitalized | $ 1,200,000 | 1,500,000 |  |  |
Revolving Credit Facility [Member] | Third Amendment and Restatement Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving Credit Facility |  |  |  |  | $ 200,000,000
Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Termination date of the revolving facility | Revolving facility remains November 6, 2020. The term loan has an $11,000,000 repayment installment due December 28, 2017, a $16,500,000 installment due December 28, 2018 and a $22,000,000 installment due December 28, 2019, with the outstanding balance due on November 6, 2020. |  |  |  |
Installment due December 28, 2017 |  |  |  | $ 11,000,000 |
Installment due December 28, 2018 |  |  |  | 16,500,000 |
Installment due December 28, 2019 |  |  |  | $ 22,000,000 |
Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 110,000,000 | $ 0 |  |  |
Term Loan [Member] | Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  |  |  | $ 110,000,000

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