Credit Facility - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 23, 2016	Dec. 31, 2014
Line of Credit Facility [Line Items]
Description of borrowing availability under credit facility	Available borrowings under the Credit Facility are limited to 85% of the net amount of eligible accounts receivable, plus 85% of the net amount of eligible unbilled accounts receivable, plus 80% of the net amount of eligible employee placement accounts, minus certain minimum availability reserve; provided, that the Firm may, subject to certain conditions, elect to increase the available borrowing limitation based on a percentage of the appraised fair market value of the Firm's corporate headquarters property and/or an additional percentage of net eligible accounts receivable, net eligible unbilled accounts receivable and net eligible employee placement accounts.
Interest rate terms	Outstanding borrowings under the Revolving Loan Amount bear interest at a rate of: (a) LIBOR plus an applicable margin based on various factors; or (b) the higher of (1) the prime rate, (2) the federal funds rate plus 0.50% or (3) LIBOR plus 1.25%.
Percentage of accounts receivable	85.00%
Percentage of unbilled accounts receivable	85.00%
Percentage of employee placement accounts	80.00%
Percentage of interest rate under revolving loan amount, condition 1	1.25%
Percentage of interest rate under revolving loan amount, condition 2	0.50%
Percentage of interest rate under revolving loan amount, condition 3	0.125%
Percentage of aggregate amount of the commitment	10.00%
Minimum availability under credit facility to avoid negative covenants	$ 11,000,000
Borrowing capacity under credit facility	48,500,000
Amount outstanding under Credit Facility	80,500,000		$ 93,300,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity under credit facility	170,000,000
Remaining credit facility under accordion option	$ 50,000,000
Unused credit facility commitment fee percentage threshold	35.00%
Covenant limit on distributions and equity repurchases percent	12.50%
Covenant limit on distributions and equity repurchases	$ 20,600,000
Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Amount outstanding under Credit Facility		$ 88,400,000
Credit facility remaining borrowing capacity		$ 43,500,000
Revolving Credit Facility | Below Threshold
Line of Credit Facility [Line Items]
Unused credit facility commitment fee percentage	0.35%
Revolving Credit Facility | Above Threshold
Line of Credit Facility [Line Items]
Unused credit facility commitment fee percentage	0.25%
Letter of Credit
Line of Credit Facility [Line Items]
Sub-limit under credit facility for letters of credit	$ 15,000,000.0