Changes in Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Beginning balance	1,750		183,208		311,169
Exercise of SARs and stock options, net of surrenders, shares	(1,500)	[1]	(173,208)	[1]	(18,725)	[1]
Number of Stock Options, Forfeited			(21)
Number of Stock Options, Cancelled			(8,229)		(109,236)
Outstanding, Ending balance	250		1,750		183,208
Weighted Average Base Price, Outstanding, Beginning balance	$ 6.91		$ 6.25		$ 16.64
Weighted Average Base Price, Exercised	$ 7.34		$ 6.03		$ 8.06
Weighted Average Base Price, Forfeited			$ 8.41
Weighted Average Base Price, Cancelled			$ 10.62		$ 42.07
Weighted Average Base Price, Outstanding, Ending balance	$ 4.30		$ 6.91		$ 6.25
Weighted Average Fair Value, Outstanding, Beginning balance	$ 4.14		$ 4.97		$ 14.30
Weighted Average Fair Value, Granted
Weighted Average Fair Value, Exercised	$ 4.42	[1]	$ 4.83	[1]	$ 6.22	[1]
Weighted Average Fair Value, Forfeited			$ 4.96
Weighted Average Fair Value, Cancelled			$ 8.16		$ 36.36
Weighted Average Fair Value, Outstanding, Ending balance	$ 2.47		$ 4.14		$ 4.97

[1] ICG received cash of less than $0.1 million, $1.0 million and $0.2 million related to stock options exercised during the years ended December 31, 2013, 2012 and 2011.