SUPPLEMENTAL CONSOLIDATING FINANCIAL INFORMATION - Supplemental Consolidating Statement of Operations Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 180,202	$ 161,448
Costs, expenses and other:
Cost of sales	138,630	130,421
Depreciation, depletion and amortization	16,059	14,426
Selling and administrative	13,331	11,887
Heritage health benefit expenses	3,544	3,951
Loss (gain) on sales of assets	38	(234)
Restructuring charges	397	0
Other operating loss (income)	150	(4,737)
Total costs, expenses and other	172,149	155,714
Operating income (loss)	8,053	5,734
Other income (expense):
Interest expense	(20,798)	(10,160)
Interest income	302	297
Loss on foreign exchange	(6,790)	0
Other income	93	70
Total other income (expense)	(27,193)	(9,793)
Income (loss) before income taxes and income of consolidated subsidiaries	(19,140)	(4,059)
Equity in income of subsidiaries	0	0
Loss before income taxes	(19,140)	(4,059)
Income tax expense (benefit)	(110)	28
Net loss	(19,030)	(4,087)
Less net loss attributable to noncontrolling interest	0	(1,702)
Net income (loss) attributable to the Parent company	(19,030)	(2,385)
Parent/ Issuer
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs, expenses and other:
Cost of sales	0	0
Depreciation, depletion and amortization	76	94
Selling and administrative	3,746	3,054
Heritage health benefit expenses	3,326	3,689
Loss (gain) on sales of assets	0	0
Restructuring charges	0
Other operating loss (income)	0	0
Total costs, expenses and other	7,148	6,837
Operating income (loss)	(7,148)	(6,837)
Other income (expense):
Interest expense	(18,673)	(7,584)
Interest income	123	30
Loss on foreign exchange	(6,790)
Other income	1	0
Total other income (expense)	(25,339)	(7,554)
Income (loss) before income taxes and income of consolidated subsidiaries	(32,487)	(14,391)
Equity in income of subsidiaries	13,319	10,304
Loss before income taxes	(19,168)	(4,087)
Income tax expense (benefit)	(138)	0
Net loss	(19,030)	(4,087)
Less net loss attributable to noncontrolling interest	0	(1,702)
Net income (loss) attributable to the Parent company	(19,030)	(2,385)
Co-Issuer
Condensed Financial Statements, Captions [Line Items]
Revenues	22,012	19,336
Costs, expenses and other:
Cost of sales	16,454	16,954
Depreciation, depletion and amortization	2,524	2,531
Selling and administrative	894	855
Heritage health benefit expenses	0	0
Loss (gain) on sales of assets	0	0
Restructuring charges	397
Other operating loss (income)	0	0
Total costs, expenses and other	20,269	20,340
Operating income (loss)	1,743	(1,004)
Other income (expense):
Interest expense	(44)	(10)
Interest income	4	10
Loss on foreign exchange	0
Other income	0	0
Total other income (expense)	(40)	0
Income (loss) before income taxes and income of consolidated subsidiaries	1,703	(1,004)
Equity in income of subsidiaries	0	0
Loss before income taxes	1,703	(1,004)
Income tax expense (benefit)	0	0
Net loss	1,703	(1,004)
Less net loss attributable to noncontrolling interest	0	0
Net income (loss) attributable to the Parent company	1,703	(1,004)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	64,292	50,687
Costs, expenses and other:
Cost of sales	50,558	40,421
Depreciation, depletion and amortization	6,269	5,189
Selling and administrative	2,994	2,637
Heritage health benefit expenses	0	0
Loss (gain) on sales of assets	(1)	(133)
Restructuring charges	0
Other operating loss (income)	150	(4,737)
Total costs, expenses and other	59,970	43,377
Operating income (loss)	4,322	7,310
Other income (expense):
Interest expense	(110)	(74)
Interest income	25	44
Loss on foreign exchange	0
Other income	55	92
Total other income (expense)	(30)	62
Income (loss) before income taxes and income of consolidated subsidiaries	4,292	7,372
Equity in income of subsidiaries	0	0
Loss before income taxes	4,292	7,372
Income tax expense (benefit)	(1,511)	496
Net loss	5,803	6,876
Less net loss attributable to noncontrolling interest	0	0
Net income (loss) attributable to the Parent company	5,803	6,876
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	93,898	100,401
Costs, expenses and other:
Cost of sales	71,618	82,022
Depreciation, depletion and amortization	7,190	6,612
Selling and administrative	5,697	5,341
Heritage health benefit expenses	218	262
Loss (gain) on sales of assets	39	(101)
Restructuring charges	0
Other operating loss (income)	0	0
Total costs, expenses and other	84,762	94,136
Operating income (loss)	9,136	6,265
Other income (expense):
Interest expense	(1,978)	(2,500)
Interest income	157	221
Loss on foreign exchange	0
Other income	37	(22)
Total other income (expense)	(1,784)	(2,301)
Income (loss) before income taxes and income of consolidated subsidiaries	7,352	3,964
Equity in income of subsidiaries	0	0
Loss before income taxes	7,352	3,964
Income tax expense (benefit)	6,626	2,823
Net loss	726	1,141
Less net loss attributable to noncontrolling interest	0	0
Net income (loss) attributable to the Parent company	726	1,141
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Revenues	0	(8,976)
Costs, expenses and other:
Cost of sales	0	(8,976)
Depreciation, depletion and amortization	0	0
Selling and administrative	0	0
Heritage health benefit expenses	0	0
Loss (gain) on sales of assets	0	0
Restructuring charges	0
Other operating loss (income)	0	0
Total costs, expenses and other	0	(8,976)
Operating income (loss)	0	0
Other income (expense):
Interest expense	7	8
Interest income	(7)	(8)
Loss on foreign exchange	0
Other income	0	0
Total other income (expense)	0	0
Income (loss) before income taxes and income of consolidated subsidiaries	0	0
Equity in income of subsidiaries	(13,319)	(10,304)
Loss before income taxes	(13,319)	(10,304)
Income tax expense (benefit)	(5,087)	(3,291)
Net loss	(8,232)	(7,013)
Less net loss attributable to noncontrolling interest	0	0
Net income (loss) attributable to the Parent company	$ (8,232)	$ (7,013)