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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2019 | Jan. 23, 2019 | Feb. 27, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 21, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  | $ 140,088 | $ 140,335 | $ 128,048 | $ 120,806 | $ 126,836 | $ 185,112 | $ 184,673 | $ 170,279 | $ 529,277 | $ 666,900 | $ 636,781 |
Other receivables |  |  |  | 36,699 |  |  |  | 26,578 |  |  |  | 36,699 | 26,578 |  |
Future minimum lease payments receivable |  |  |  | 13,009 |  |  |  | $ 14,238 |  |  |  | 13,009 | $ 14,238 |  |
Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum lease payments receivable |  |  |  | 7,800 |  |  |  |  |  |  |  | $ 7,800 |  |  |
Sales Revenue, Net [Member] | Customer 1 [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  | 27.00% | 40.00% | 24.00% |
Leased Equipment Arrangement [Member] | Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |
Other receivables |  |  |  | $ 9,400 |  |  |  |  |  |  |  | 9,400 |  |  |
Product and Service [Member] | Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 2,600 |  |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declaration date |  | Jan. 23, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends per share declared |  | $ 0.09 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Feb. 07, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payment date |  | Feb. 21, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend payable subsequent to balance sheet date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300
Stock repurchased, shares | 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased, average price per share | $ 14.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares authorized for purchase | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Member] | Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum lease payments receivable |  |  | $ 9,400 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Member] | Sales Revenue, Net [Member] | Customer 1 [Member] | Maximum [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Member] | Leased Equipment Arrangement [Member] | Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable collected |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |
Other receivable collected |  |  | 1,700 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Member] | Product and Service [Member] | Customer 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable collected |  |  | $ 2,600 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events [Member] | Collateral Pledged [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivables | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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