Discontinued Operations - Schedule of Major Classes of Revenue and Income (Losses) with Respect to the Discontinued Operations (Detail) - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contract revenue	$ 1,124	$ 97,499
Contract costs	1,070	86,058
Amortization of intangibles		624
(Gain) loss on sale of subsidiaries	1,545	(58,549)
General and administrative	361	12,390
Other charges		940
Operating income (loss)	(1,852)	56,036
Non-operating income (expenses)	(1)	(5)
Pre-tax loss	(1,853)	56,041
Provision for income taxes	0	20,921
Net loss	(1,853)	35,120
Assets with respect to discontinued operations
Accounts receivable, net	684		$ 322
Contract cost and recognized income not yet billed	1,124		924
Prepaid expenses and other current assets	1		1
Total assets	1,809		1,247
Accounts payable and accrued liabilities	618		1,267
Contract billings in excess of costs and recognized income	1,216		1,457
Other current liabilities	885		1,303
Other long-term liabilities	1,364		1,423
Total liabilities	4,083		5,450
Net assets (liabilities) of discontinued operations	(2,274)		(4,203)
Professional Services Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contract revenue	1,124	96,578
Contract costs	1,070	85,139
Amortization of intangibles		624
(Gain) loss on sale of subsidiaries	1,545	(58,549)
General and administrative	361	11,978
Other charges		940
Operating income (loss)	(1,852)	56,446
Non-operating income (expenses)	(1)	12
Pre-tax loss	(1,853)	56,434
Provision for income taxes	0	20,921
Net loss	(1,853)	35,513
Assets with respect to discontinued operations
Accounts receivable, net	684		313
Contract cost and recognized income not yet billed	1,124		924
Prepaid expenses and other current assets	1		0
Total assets	1,809		1,237
Accounts payable and accrued liabilities	169		815
Contract billings in excess of costs and recognized income	1,216		1,457
Other current liabilities	885		1,303
Other long-term liabilities	1,364		1,423
Total liabilities	3,634		4,998
Net assets (liabilities) of discontinued operations	(1,825)		(3,761)
Hawkeye [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contract revenue	0	921
Contract costs	0	919
Amortization of intangibles		0
(Gain) loss on sale of subsidiaries	0	0
General and administrative	0	412
Other charges		0
Operating income (loss)	0	(410)
Non-operating income (expenses)	0	(17)
Pre-tax loss	0	(393)
Provision for income taxes	0	0
Net loss	0	$ (393)
Assets with respect to discontinued operations
Accounts receivable, net	0		9
Contract cost and recognized income not yet billed	0		0
Prepaid expenses and other current assets	0		1
Total assets	0		10
Accounts payable and accrued liabilities	449		452
Contract billings in excess of costs and recognized income	0		0
Other current liabilities	0		0
Other long-term liabilities	0		0
Total liabilities	449		452
Net assets (liabilities) of discontinued operations	$ (449)		$ (442)