Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Effective tax rate from continuing operations	30.10%	54.20%	27.60%	46.20%
Net unrealized built in loss, recognition period			5 years
Annual limitation net operating loss	$ 1,700,000		$ 1,700,000
Net deferred tax assets	109,269,000		109,269,000		103,881,000
Unrecognized tax benefits	125,000		125,000
Income tax (benefit) expense	(2,912,000)	1,243,000	(2,530,000)	1,760,000
SV Holdco, LLC [Member]
Income Taxes [Line Items]
Unrecognized tax benefits					2,764,000
Income tax (benefit) expense	(2,639,000)		(2,639,000)
Portion of deferred tax assets related to previously unrecognized tax benefits	$ 2,453,000		$ 2,453,000