Note 8. Stockholders' Equity (Detail) - Statement of Stockholders’ Equity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended					3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012	Mar. 31, 2013 Common Stock [Member] Common Class A [Member]	Mar. 31, 2013 Common Stock [Member] Common Class B [Member]	Dec. 31, 2012 Common Stock [Member] Common Class B [Member]	Mar. 31, 2013 Additional Paid-in Capital [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 Retained Earnings [Member]	Mar. 31, 2013 Total Equity [Member]
Balance at December 31, 2012 (in Shares)			27,215,117
Balance at December 31, 2012	$ (176,224)		$ 136,076	$ 2,743	$ 2,743	$ 23,024	$ (219,656)	$ (118,411)	$ (176,224)
Net loss	(17,695)	(34,424)						(17,695)	(17,695)
Amortization of prior-service cost	25						25		25
Amortization of net loss	1,900						1,900		1,900
Exercise of stock options (in Shares)			54,398
Exercise of stock options			272			(138)			134
Performance accelerated restricted stock (in Shares)			(42,143)
Performance accelerated restricted stock			(211)			30			(181)
Stock-based compensation						228			228
Other (in Shares)			10
Other						83			83
Balance at March 31, 2013 (in Shares)			27,227,382
Balance at March 31, 2013	$ (191,730)		$ 136,137	$ 2,743	$ 2,743	$ 23,227	$ (217,731)	$ (136,106)	$ (191,730)