Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current:
Employee benefits	$ 13,258	$ 17,765
Self insurance	4,346	5,047
Environmental	162	165
Other	5,726	4,379
Total	23,492	27,356
Noncurrent:
Workers compensation payments	1,712	1,612
Environmental	125	140
Other	778	657
Total	$ 2,615	$ 2,409