Receivables - Receivables (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Trade receivables	$ 34,547,000	$ 34,025,000
Less: allowance for doubtful accounts	(348,000)	(281,000)
Trade receivables, net	34,199,000	33,744,000
Recoverable income taxes	21,000	81,000
Other	361,000	141,000
Receivables, net	$ 34,581,000	$ 33,966,000