Credit Facility - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2013	Sep. 30, 2015
Line Of Credit Facility [Line Items]
Revolving loans and letters of credit	$ 50,000,000
Additional Credit Facility	$ 50,000,000
Amount available under credit facility		$ 49,900,000
Period of credit agreement	3 years
LIBOR rate description		the federal funds effective rate plus 0.50% and (c) one month adjusted LIBOR plus 1.00% plus (ii) 0.50% or (B) the sum of (i) adjusted LIBOR plus (ii) 1.50%
Federal funds effective rate		0.50%
One month adjusted LIBOR		1.00%
LIBOR Rate		0.50%
Adjusted LIBOR rate		1.50%
Interest per annum		2.00%
Revolving loan commitment rate		0.30%
Equity interest		65.00%
Maximum [Member]
Line Of Credit Facility [Line Items]
Total leverage ratio		250.00%
Minimum [Member]
Line Of Credit Facility [Line Items]
Interest coverage ratio		350.00%
Excess judgments against the company		$ 10,000,000