Income Taxes - Statutory Federal Tax Rate of Income from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax at statutory rate, Amount	$ 2,468	$ 1,570	$ 628
Add (deduct), Amount
State income taxes, net of federal tax benefit, Amount	556	243	174
Tax rate difference on foreign income taxes, Amount	26	47	188
Tax effect of rate change on deferred tax assets, Amount	252	(169)
Non-deductible items, Amount	112	98	160
Net decrease in deferred tax attributes, Amount	183	4,370	516
Decrease in valuation allowance against certain deferred tax assets, Amount		(36,226)	(1,323)
Unrecognized tax benefits, Amount	(370)	(28)	17
Other, net, Amount	(50)	6	41
Income tax provision (benefit)	$ 3,177	$ (30,089)	$ 401
Income tax at statutory rate	34.00%	34.00%	34.00%
Add (deduct):
State income taxes, net of federal tax benefit, Rate	7.70%	5.20%	9.40%
Tax rate difference on foreign income taxes, Rate	0.40%	1.00%	10.10%
Tax effect of rate change on deferred tax assets, Rate	3.50%	(3.60%)
Non-deductible items, Rate	1.60%	2.10%	8.60%
Net decrease in deferred tax attributes, Rate	2.50%	94.60%	27.90%
Decrease in valuation allowance against certain deferred tax assets, Rate		(784.30%)	(71.60%)
Unrecognized tax benefits, Rate	(5.10%)	(0.60%)	0.90%
Other, net, Rate	(0.70%)	0.10%	2.40%
Income (loss) from continuing operations	43.90%	(651.50%)	21.70%