Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 73,665	$ 99,837	$ 53,655	$ 122,882
Other current assets	485,779	474,785
Plant, equipment and timberlands, net	697,324	697,608
Other assets	280,979	289,274
Total assets	1,537,747	1,561,504
Liabilities and Shareholders' Equity
Current liabilities	292,350	279,731
Long-term debt	381,535	398,878
Deferred income taxes	101,207	104,016
Other long-term liabilities	116,539	129,770
Total liabilities	891,631	912,395
Shareholders' equity	646,116	649,109
Total liabilities and shareholders' equity	1,537,747	1,561,504
Adjustments/ Eliminations [Member]
Assets
Other current assets	(268,192)	(436,976)
Investments in subsidiaries	(1,239,086)	(1,227,624)
Other assets	(485)	(17,979)
Total assets	(1,507,763)	(1,682,579)
Liabilities and Shareholders' Equity
Current liabilities	(271,574)	(444,258)
Long-term debt		(572,579)
Deferred income taxes	3,376	(12,289)
Other long-term liabilities		5,780
Total liabilities	(268,198)	(1,023,346)
Shareholders' equity	(1,239,565)	(659,233)
Total liabilities and shareholders' equity	(1,507,763)	(1,682,579)
Parent Company [Member]
Assets
Cash and cash equivalents	28,626	42,208	20,308	56,216
Other current assets	232,486	216,940
Plant, equipment and timberlands, net	283,712	255,255
Investments in subsidiaries	734,303	826,084
Other assets	132,732	121,125
Total assets	1,411,859	1,461,612
Liabilities and Shareholders' Equity
Current liabilities	368,220	403,662
Long-term debt	250,000	250,000
Deferred income taxes	48,226	46,483
Other long-term liabilities	99,297	112,358
Total liabilities	765,743	812,503
Shareholders' equity	646,116	649,109
Total liabilities and shareholders' equity	1,411,859	1,461,612
Guarantors [Member]
Assets
Cash and cash equivalents	297	509	90	495
Other current assets	260,054	439,910
Plant, equipment and timberlands, net	1,005	996
Investments in subsidiaries	504,783	401,540
Total assets	766,139	842,955
Liabilities and Shareholders' Equity
Current liabilities	31,720	13,143
Deferred income taxes	(505)	(506)
Other long-term liabilities	33	24
Total liabilities	31,248	12,661
Shareholders' equity	734,891	830,294
Total liabilities and shareholders' equity	766,139	842,955
Non Guarantors [Member]
Assets
Cash and cash equivalents	44,742	57,120	$ 33,257	$ 66,171
Other current assets	261,431	254,911
Plant, equipment and timberlands, net	412,607	441,357
Other assets	148,732	186,128
Total assets	867,512	939,516
Liabilities and Shareholders' Equity
Current liabilities	163,984	307,184
Long-term debt	131,535	721,457
Deferred income taxes	50,110	70,328
Other long-term liabilities	17,209	11,608
Total liabilities	362,838	1,110,577
Shareholders' equity	504,674	(171,061)
Total liabilities and shareholders' equity	$ 867,512	$ 939,516