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Restatement of Previously Issued Condensed Consolidated Financial Statements - Impact on Condensed Consolidated Statement of Cash Flows (Unaudited) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (8,003) $ (5,828) [1]
Reconciliations of net loss to net cash provided by operating activities:    
Depreciation and amortization 749 683 [1]
Losses recognized on marketable securities (1) 2 [1]
Deferred income taxes 0 74 [1]
Share based compensation 359 545 [1]
Excess tax benefit from share-based compensation (265) (15) [1]
Changes in certain operating assets and liabilities:    
Trade accounts receivable (73,302) (27,749) [1]
Income taxes receivable (2,969) (2,184) [1]
Prepaid expenses and other (2,595) (2,845) [1]
Accounts payable 723 781 [1]
Accrued payroll, payroll taxes and related benefits 66,767 34,162 [1]
Other accrued liabilities 392 (40) [1]
Workers' compensation claims liabilities 9,468 6,445 [1]
Safety incentives liability 563 1,267 [1]
Customer deposits, long-term liabilities and other assets, net 297 205 [1]
Net cash provided by operating activities (7,817) 5,503 [1]
Cash flows from investing activities:    
Purchase of property and equipment (1,368) (657) [1]
Purchase of marketable securities (207) (1,454) [1]
Proceeds from sales and maturities of marketable securities 178 24,651 [1]
Purchase of restricted marketable securities (26,830) (29,932) [1]
Proceeds from maturities of restricted marketable securities 55,634 1,192 [1]
Net cash used in investing activities 27,407 (6,200) [1]
Cash flows from financing activities:    
Proceeds from credit-line borrowings 11,300 28,251 [1]
Payments on credit-line borrowings (11,300) (22,479) [1]
Payments on long-term debt (55) (55) [1]
Dividends paid (1,586) (1,569) [1]
Proceeds from the exercise of stock options and vesting of restricted stock units 72 195 [1]
Excess tax benefit from share-based compensation 265 15 [1]
Net cash (used in) provided by financing activities (1,344) 4,358 [1]
Net increase in cash and cash equivalents 18,246 3,661 [1]
Cash and cash equivalents, beginning of period 25,218 11,544 [1]
Cash and cash equivalents, end of period $ 43,464 15,205 [1]
As Previously Reported [Member]    
Cash flows from operating activities:    
Net loss   (5,802)
Reconciliations of net loss to net cash provided by operating activities:    
Depreciation and amortization   683
Losses recognized on marketable securities   2
Deferred income taxes   56
Share based compensation   545
Excess tax benefit from share-based compensation   (15)
Changes in certain operating assets and liabilities:    
Trade accounts receivable   (27,749)
Income taxes receivable   (2,150)
Prepaid expenses and other   (2,845)
Accounts payable   781
Accrued payroll, payroll taxes and related benefits   34,375
Other accrued liabilities   (133)
Workers' compensation claims liabilities   6,283
Safety incentives liability   1,267
Customer deposits, long-term liabilities and other assets, net   205
Net cash provided by operating activities   5,503
Cash flows from investing activities:    
Purchase of property and equipment   (657)
Purchase of marketable securities   (1,454)
Proceeds from sales and maturities of marketable securities   24,651
Purchase of restricted marketable securities   (29,932)
Proceeds from maturities of restricted marketable securities   1,192
Net cash used in investing activities   (6,200)
Cash flows from financing activities:    
Proceeds from credit-line borrowings   28,251
Payments on credit-line borrowings   (22,479)
Payments on long-term debt   (55)
Dividends paid   (1,569)
Proceeds from the exercise of stock options and vesting of restricted stock units   195
Excess tax benefit from share-based compensation   15
Net cash (used in) provided by financing activities   4,358
Net increase in cash and cash equivalents   3,661
Cash and cash equivalents, beginning of period   11,544
Cash and cash equivalents, end of period   15,205
Restatement Adjustments [Member]    
Cash flows from operating activities:    
Net loss   (26)
Reconciliations of net loss to net cash provided by operating activities:    
Depreciation and amortization   0
Losses recognized on marketable securities   0
Deferred income taxes   18
Share based compensation   0
Excess tax benefit from share-based compensation   0
Changes in certain operating assets and liabilities:    
Trade accounts receivable   0
Income taxes receivable   (34)
Prepaid expenses and other   0
Accounts payable   0
Accrued payroll, payroll taxes and related benefits   (213)
Other accrued liabilities   93
Workers' compensation claims liabilities   162
Safety incentives liability   0
Customer deposits, long-term liabilities and other assets, net   0
Net cash provided by operating activities   0
Cash flows from investing activities:    
Purchase of property and equipment   0
Purchase of marketable securities   0
Proceeds from sales and maturities of marketable securities   0
Purchase of restricted marketable securities   0
Proceeds from maturities of restricted marketable securities   0
Net cash used in investing activities   0
Cash flows from financing activities:    
Proceeds from credit-line borrowings   0
Payments on credit-line borrowings   0
Payments on long-term debt   0
Dividends paid   0
Proceeds from the exercise of stock options and vesting of restricted stock units   0
Excess tax benefit from share-based compensation   0
Net cash (used in) provided by financing activities   0
Net increase in cash and cash equivalents   0
Cash and cash equivalents, beginning of period   0
Cash and cash equivalents, end of period   $ 0
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements