Activity Regarding Outstanding SARs (Detail) (Stock Appreciation Rights (SARs), USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
SARs Shares
Options Outstanding, beginning balance			1,521,385
Granted	520,000	668,265	620,000	[1]	975,015
Exercised
Forfeited/Cancelled			(289,570)	[1],[2]
Options Outstanding, ending balance	1,851,815		1,851,815
Weighted Average Exercise Price
Options Outstanding, beginning balance			$ 3.38
Granted			$ 1.54
Exercised
Forfeited/Cancelled			$ 3.65	[2],[3]
Options Outstanding, ending balance	$ 2.72		$ 2.72
Minimum
Weighted Average Exercise Price
Price range at end of period	$ 1.34		$ 1.34
Maximum
Weighted Average Exercise Price
Price range at end of period	$ 8.50		$ 8.50

[1] Modifications of grants are included on a net basis in the table

[2] See disclosure below regarding forfeitures

[3] Modifications of option grants are included on a net basis in the table