Income Taxes - Current and Non-current Deferred Income Tax Assets (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current deferred income tax assets:
Less valuation allowance	$ 0
Total net current deferred income tax assets	16,668,000	$ 821,000
Non-current deferred income tax assets (liabilities):
Total net non-current deferred income tax liability	(32,409,000)	(821,000)
Net deferred income tax asset (liability)	(15,741,000)
Current Deferred Income Tax Assets [Member]
Current deferred income tax assets:
Allowance for doubtful accounts	15,201,000	1,548,000
Accrued vacation	962,000	334,000
Other accruals	476,000
Other	29,000	38,000
Subtotal	16,668,000	1,920,000
Less valuation allowance		(1,099,000)
Total net current deferred income tax assets	16,668,000	821,000
Non-Current Deferred Income Tax Assets (Liabilities) [Member]
Non-current deferred income tax assets (liabilities):
Net operating loss carry-forwards	502,000	1,336,000
AMT credit carry-forward	152,000	96,000
Nonqualified stock options and warrants	1,377,000	560,000
Accumulated depreciation and amortization	(34,440,000)	(1,672,000)
Subtotal	(32,409,000)	320,000
Less valuation allowance		(1,141,000)
Total net non-current deferred income tax liability	$ (32,409,000)	$ (821,000)