Other Information - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue [Line Items]
Revenues	$ 47,405,000	$ 33,848,000	$ 42,198,000	$ 37,224,000	$ 56,363,000	$ 43,549,000	$ 47,884,000	$ 49,831,000	$ 160,675,000	$ 197,627,000	$ 221,433,000
Other Expenses [Abstract]
Advertising Expense									6,900,000	9,500,000	15,300,000
Interest Paid											300,000
Income Taxes Paid									500,000	500,000	600,000
Domestic
Revenue [Line Items]
Revenues									153,100,000	187,400,000	211,600,000
Foreign Sources
Revenue [Line Items]
Revenues									$ 7,600,000	$ 10,200,000	$ 9,800,000