Equity Method Investments (Detail) - The Company’s Equity in Earnings (Loss) of Joint Ventures (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	$ (91)		$ (130)		$ (962)		$ 164
ICP [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	(135)	[1]	(134)	[1]	(1,042)	[1]	229	[1]
DMI [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	$ 44		$ 4		$ 80		$ (65)

[1] The Company’s ownership percentage of ICP was 50 percent through February 1, 2012, when the Company sold 20 percent of its investment. From February 2, 2012 through September 30, 2013, the Company’s ownership percentage in ICP and accounting profit and loss was 30 percent.