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Stockholders' Equity - Additional Information (Details) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 $ / shares shares | Oct. 26, 2018 USD ($) shares | Apr. 12, 2018 USD ($) $ / shares shares | Aug. 02, 2017 shares | Aug. 01, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | Dec. 31, 2012 $ / shares shares | Oct. 29, 2018 USD ($)
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period shares |  |  | 5,405,000 |  | 2,530,000 |  |  |  |  |
Shares issued price per share | $ / shares |  |  | $ 37.50 |  | $ 27.50 |  |  |  |  |
Gross proceeds from issuance of common stock | $ |  |  | $ 202,688,000 |  | $ 69,575,000 |  |  |  |  |
Net proceeds after underwriting discounts and offering expenses | $ |  |  | $ 192,053,000 |  | $ 65,509,000 | $ 192,053,000 | $ 65,509,000 |  |  |
Number of shares repurchased under stock repurchase program |  |  |  |  |  | 0 |  |  |  |
Exercise price of warrants, per share | $ / shares |  |  |  |  |  |  |  |  | $ 11.58 |
Warrant expiration date |  |  |  |  |  |  |  |  | Dec. 12, 2022 |
Stock issued during period shares warrants excercised |  |  |  | 153,134 |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  | Prime + 2% | Prime + 2% |  |  |
Dividend rate |  |  |  |  |  | 8.00% | 8.00% |  |  |
Company's redemption rights modified date |  |  |  |  |  | Oct. 15, 2018 |  |  |  |
Number of preferred stock converted |  | 45,500 |  |  |  |  | 0 | 0 |  |
Preferred stock converted to common stock | $ |  | $ 4,550,000 |  |  |  |  |  |  |  |
Preferred stock converted to common stock (in shares) |  | 315,773 |  |  |  |  |  |  |  |
Conversion ratio - preferred to common |  | 6.94008 |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  | 8.00% | 8.00% |  |  |
Company's redemption rights modified date |  |  |  |  |  | Oct. 15, 2018 |  |  |  |
Number of preferred stock converted |  | 51,076 |  |  |  |  | 880 | 0 |  |
Preferred stock converted to common stock | $ |  | $ 5,108,000 |  |  |  |  | $ 88,000 |  |  |
Preferred stock converted to common stock (in shares) |  | 354,463 |  |  |  |  | 6,106 |  |  |
Conversion ratio - preferred to common |  | 6.94008 |  |  |  |  |  |  |  |
Warrant |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued to Triumph Consolidated Cos LLC |  |  |  |  |  |  |  |  | 259,067 |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased and held into treasury stock | 247,312 |  |  |  |  |  |  |  |  |
Shares repurchased, average price per share | $ / shares | $ 30.51 |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Amount authorized under stock repurchase program | $ |  |  |  |  |  |  |  |  |  | $ 25,000,000
Over-Allotment Option |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period shares |  |  | 705,000 |  | 330,000 |  |  |  |  |

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