Long-term Debt - Schedule of Maturities of Long-term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 447	$ 249
Notes payable maturity date	2025-03
Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	4.00%
Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	6.00%
Delayed Draw [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 50	$ 261
Vehicle and Equipment [Member]
Debt Instrument [Line Items]
Notes payable maturity date	2021-09
Vehicle and Equipment [Member] | Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	2.00%
Vehicle and Equipment [Member] | Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	4.00%