Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified									12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Land [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2013 Land [Member] Assets Held Under Capital Leases [Member]	Dec. 31, 2012 Land [Member] Assets Held Under Capital Leases [Member]	Dec. 31, 2013 Building and Building Improvements [Member]	Dec. 31, 2012 Building and Building Improvements [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Maximum [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Minimum [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Assets Held Under Capital Leases [Member]	Dec. 31, 2012 Building and Building Improvements [Member] Assets Held Under Capital Leases [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Assets Held Under Capital Leases [Member] Maximum [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Assets Held Under Capital Leases [Member] Minimum [Member]	Dec. 31, 2013 Machinery and Equipment [Member]	Dec. 31, 2012 Machinery and Equipment [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Maximum [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Minimum [Member]	Dec. 31, 2013 Office Equipment [Member]	Dec. 31, 2012 Office Equipment [Member]	Dec. 31, 2013 Office Equipment [Member] Maximum [Member]	Dec. 31, 2013 Office Equipment [Member] Minimum [Member]	Dec. 31, 2013 Vehicles [Member]	Dec. 31, 2012 Vehicles [Member]	Dec. 31, 2013 Vehicles [Member] Maximum [Member]	Dec. 31, 2013 Vehicles [Member] Minimum [Member]
Property, Plant and Equipment, Gross [Abstract]
Property, plant and equipment, at cost	$ 258,715	$ 244,743	$ 2,215	$ 2,164	$ 692	$ 664	$ 48,779	$ 46,033			$ 6,072	$ 5,827			$ 166,747	$ 156,551			$ 33,649	$ 32,939			$ 561	$ 565
Accumulated depreciation	(183,535)	(170,306)
Accumulated amortization of capital leases	(3,078)	(2,646)
Property And Equipment Net Excluding Work In Progress	72,102	71,791
Construction in progress	6,761	4,463
Total property, plant and equipment	$ 78,863	$ 76,254
Property, Plant and Equipment, Estimated Useful Lives									35	10			35	10			25	5			8	2			6	3