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Equity Compensation Plans - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) executive | Dec. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares of common stock available for grant under Redwood's Incentive Plan (in shares) | 1,547,611 |  | 1,787,974
Unrecognized compensation cost | $ | $ 21,936 |  | $ 18,146
Equity compensation expense | $ | $ 2,176 |  |
Number of shares purchased by employees (in shares) | 343,097 |  | 337,271
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 270,285 |  | 204,515
Number of stock awards granted (in shares) | 134,364 |  |
Number of stock awards vested (in shares) | 60,270 |  |
Number of stock awards forfeited (in shares) | 8,324 |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 1,902,998 |  | 1,848,861
Number of stock awards granted (in shares) | 230,235 |  |
Number of stock awards vested (in shares) | 844,013 |  | 939,899
Number of stock awards forfeited (in shares) | 0 |  |
Number of stock awards distributed (in shares) | 176,098 |  |
Equity compensation expense | $ |  | $ 3,000 |
Number of executives departed (in executives) | executive |  | 2 |
Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 642,879 |  | 642,879
Performance Stock Units | Performance Share Units (PSUs), 2016 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation, vesting period (in years) | 3 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average amortization period remaining for equity awards (less than) | 2 years |  |
Shares of common stock to be purchased in aggregate for all employees (in shares) | 450,000 |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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