Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current:
Employee benefits	$ 17,765	$ 16,549
Self insurance	5,047	6,686
Environmental	165	240
Other	4,379	5,886
Total	27,356	29,361
Noncurrent:
Workers compensation payments	1,612	1,243
Environmental	140	165
Other	657	483
Total	$ 2,409	$ 1,891