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v3.7.0.1

Long-Term Debt - Notes Payable to BMI - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Cash Collateral |  | $ 24,200,000 | $ 19,600,000 |  |
Repayment of note payable |  | 309,000,000 | $ 53,400,000 | $ 343,100,000 |
BMI | Bank note payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Note payable, secured |  |  |  |  | $ 11,900,000
Cash Collateral |  |  |  |  | $ 750,000
Periodic principal payments |  | $ 100,000 |  |  |
Loans maturity period |  | Jan. 31, 2025 |  |  |
Frequency of debt instrument payment |  | Monthly |  |  |
Interest rate terms |  | The note bears interest at a variable rate equal to the prime rate with a floor of 3.25% and a ceiling of 9.0 |  |  |
Debt instrument, average interest rate during period |  | 3.50% |  |  |
Notes payable outstanding |  | $ 8,500,000 |  |  |
Debt instrument, Effective interest rate at period end |  | 3.75% |  |  |
Debt issuance cost |  | $ 100,000 |  |  |
BMI | Bank note payable | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of note payable | $ 8,500,000 |  |  |  |
BMI | Bank note payable | 2017 Bank Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Frequency of debt instrument payment | semi-annual |  |  |  |
Debt issuance cost | $ 1,000,000 |  |  |  |
Principal amount of loan agreement | $ 20,500,000 |  |  |  |
Debt instrument, payment terms | The agreement requires semi-annual payments of principal and interest on June 1 and December 1 aggregating $1.9 million annually beginning on June 1, 2017 through the maturity date in June 2032 (except during 2017 which calls for prorated aggregate principal and interest payments of $1.6 million). |  |  |  |
Periodic principal and interest payments | $ 1,900,000 |  |  |  |
Loans maturity period | 2032-06 |  |  |  |
Prorated principal and interest payments | $ 1,600,000 |  |  |  |
Interest rate | 5.34% |  |  |  |
BMI | Bank note payable | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, average interest rate during period |  | 9.00% |  |  |
BMI | Bank note payable | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, average interest rate during period |  | 3.25% |  |  |

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