Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
Statutory tax rate	35.00%	35.00%	35.00%
Deferred tax assets operating loss carry forwards, total	$ 22,500,000
Valuation allowance related to gross deferred tax assets	2,249,000	2,199,000
Decrease to eliminate unrecognized tax benefit related to bad debts	1,673,000	0	0
Tax related interest	100,000	200,000
Adjustments impacting tax expense	0
Minimum [Member]
Schedule Of Income Taxes [Line Items]
Deferred tax assets operating loss carry forwards, expiry date	2020
Maximum [Member]
Schedule Of Income Taxes [Line Items]
Deferred tax assets operating loss carry forwards, expiry date	2034
PENNSYLVANIA
Schedule Of Income Taxes [Line Items]
Valuation allowance related to gross deferred tax assets	$ 2,200,000