Line of Credit - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Total availability under line of credit agreement	$ 10.0	$ 10.0
Letters of credit outstanding amount	3.0
Available borrowing under letter of credit	$ 7.0
Varying Interest on Line of credit agreement	LIBOR plus 1.5% or Prime less 0.75%
Maturity date of line of credit	Jul. 31, 2016
Maximum ratio of total liabilities to tangible net worth	1
Minimum required fixed coverage charge ratio	1.25
Period used for calculating ratios	12 months
Company's tangible net worth ratio	0.42
Fixed coverage charge ratio	2.81
Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit interest rate	1.50%
Line of Credit | Prime Rate
Debt Instrument [Line Items]
Line of credit interest rate	0.75%