Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Effective tax rate from continuing operations	42.60%	41.80%	77.60%	34.30%
Net unrealized built in loss, recognition period			5 years
Annual limitation net operating loss	$ 1,700,000		$ 1,700,000
Net deferred tax assets	104,615,000		104,615,000		103,881,000
Unrecognized tax benefits	2,764,000		2,764,000		2,764,000
SV Holdco, LLC [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 2,560,000		$ 2,560,000