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Components of Operating Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Component of Operating Other Cost and Expense [Abstract]
Fixed compensation expense									$ 29,057rwt_FixedCompensationExpense	$ 23,248rwt_FixedCompensationExpense	$ 17,880rwt_FixedCompensationExpense
Variable compensation expense									14,632rwt_VariableCompensationExpense	18,366rwt_VariableCompensationExpense	16,720rwt_VariableCompensationExpense
Equity compensation expense									9,750us-gaap_AllocatedShareBasedCompensationExpense	10,077us-gaap_AllocatedShareBasedCompensationExpense	9,784us-gaap_AllocatedShareBasedCompensationExpense
Severance expense									231us-gaap_SeveranceCosts1	3,879us-gaap_SeveranceCosts1	215us-gaap_SeveranceCosts1
Total compensation expense									53,670us-gaap_LaborAndRelatedExpense	55,570us-gaap_LaborAndRelatedExpense	44,599us-gaap_LaborAndRelatedExpense
Systems and consulting									14,546us-gaap_CommunicationsAndInformationTechnology	9,886us-gaap_CommunicationsAndInformationTechnology	5,339us-gaap_CommunicationsAndInformationTechnology
Accounting and legal									5,244us-gaap_ProfessionalFees	6,263us-gaap_ProfessionalFees	5,197us-gaap_ProfessionalFees
Office costs									5,011us-gaap_GeneralAndAdministrativeExpense	3,503us-gaap_GeneralAndAdministrativeExpense	3,628us-gaap_GeneralAndAdministrativeExpense
Corporate costs									2,237us-gaap_OtherGeneralExpense	2,721us-gaap_OtherGeneralExpense	2,758us-gaap_OtherGeneralExpense
Other operating expenses									9,415us-gaap_OtherCostAndExpenseOperating	8,664us-gaap_OtherCostAndExpenseOperating	4,112us-gaap_OtherCostAndExpenseOperating
Total Operating Expenses	$ (26,462)us-gaap_OperatingExpenses	$ (21,406)us-gaap_OperatingExpenses	$ (22,282)us-gaap_OperatingExpenses	$ (19,973)us-gaap_OperatingExpenses	$ (19,670)us-gaap_OperatingExpenses	$ (22,320)us-gaap_OperatingExpenses	$ (24,430)us-gaap_OperatingExpenses	$ (20,187)us-gaap_OperatingExpenses	$ 90,123us-gaap_OperatingExpenses	$ 86,607us-gaap_OperatingExpenses	$ 65,633us-gaap_OperatingExpenses

X

- Definition

Fixed Compensation Expense

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Variable Compensation Expense

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense in the period for communications and data processing expense.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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