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Supplemental Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings (loss) $ 18,446 $ 5,757  
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:      
Depreciation and amortization 21,150 21,008  
Equity-based compensation expense 2,172 1,169  
Deferred tax expense (benefit) 4,365 (1,330)  
Employee benefit plans (1,389) 809  
Amortization of Financing Costs and Discounts 213 178  
Gain (Loss) on Disposition of Assets 0 (30)  
Other Noncash Income Tax Expense (151) (990)  
Changes in working capital, net (9,548) 3,457  
Change in taxes receivable, net 14,172 1,255  
Excess tax benefits from equity share-based payment arrangements 0 343  
Funding of qualified pension plans 0 (1,561)  
Other Operating Activities, Cash Flow Statement (408) (1,327)  
Net cash provided by operating activities 49,022 28,052  
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net 250 39,000  
Additions to plant and equipment (30,955) (25,240)  
Proceeds from Sale of Productive Assets 0 506  
Net cash used for investing activities (30,705) 14,266  
CASH FLOWS FROM FINANCING ACTIVITIES      
Payments for Repurchase of Common Stock (27,661) (37,148)  
Investment (to) from Parent 0 0  
Proceeds from Lines of Credit 123,287 0  
Repayments of Lines of Credit (117,282)   $ 0
Payment of tax withholdings on equity-based payment arrangements (43) (3,048)  
Excess Tax Benefit from Share-based Compensation, Financing Activities 0 343  
Net cash (used for) provided by financing activities (21,699) (39,853)  
Increase in cash (3,382) 2,465  
Cash at beginning of period 5,610 27,331 27,331
Cash at end of period 2,228 29,796 5,610
Issuer      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings (loss) 18,446 3,885  
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:      
Depreciation and amortization 16,061 16,114  
Equity-based compensation expense 2,172 1,169  
Deferred tax expense (benefit) 3,329 (3,231)  
Employee benefit plans (1,389) 809  
Amortization of Financing Costs and Discounts 213 178  
Gain (Loss) on Disposition of Assets   0  
Other Noncash Income Tax Expense (156) (983)  
Changes in working capital, net (11,062) 1,537  
Change in taxes receivable, net 15,575 6,760  
Excess tax benefits from equity share-based payment arrangements   343  
Funding of qualified pension plans   (1,561)  
Other Operating Activities, Cash Flow Statement (338) (1,261)  
Net cash provided by operating activities 42,851 23,073  
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net 250 39,000  
Additions to plant and equipment (27,475) (23,262)  
Proceeds from Sale of Productive Assets   0  
Net cash used for investing activities (27,225) 15,738  
CASH FLOWS FROM FINANCING ACTIVITIES      
Payments for Repurchase of Common Stock (27,661) (37,148)  
Investment (to) from Parent 2,691 3,507  
Proceeds from Lines of Credit 123,287    
Repayments of Lines of Credit (117,282)    
Payment of tax withholdings on equity-based payment arrangements (43) (3,048)  
Excess Tax Benefit from Share-based Compensation, Financing Activities   343  
Net cash (used for) provided by financing activities (19,008) (36,346)  
Increase in cash (3,382) 2,465  
Cash at beginning of period 5,610 27,331 27,331
Cash at end of period 2,228 29,796 5,610
Guarantor Subsidiaries      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings (loss) 1,064 (4,673)  
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:      
Depreciation and amortization 5,089 4,894  
Equity-based compensation expense 0 0  
Deferred tax expense (benefit) 2,174 44  
Employee benefit plans 0 0  
Amortization of Financing Costs and Discounts 0 0  
Gain (Loss) on Disposition of Assets   (30)  
Other Noncash Income Tax Expense 5 (7)  
Changes in working capital, net 1,514 1,920  
Change in taxes receivable, net (1,403) (15,758)  
Excess tax benefits from equity share-based payment arrangements   0  
Funding of qualified pension plans   0  
Other Operating Activities, Cash Flow Statement (70) (66)  
Net cash provided by operating activities 8,373 (13,676)  
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net 0 0  
Additions to plant and equipment (3,480) (1,978)  
Proceeds from Sale of Productive Assets   506  
Net cash used for investing activities (3,480) (1,472)  
CASH FLOWS FROM FINANCING ACTIVITIES      
Payments for Repurchase of Common Stock 0 0  
Investment (to) from Parent (4,893) 15,148  
Proceeds from Lines of Credit 0    
Repayments of Lines of Credit 0    
Payment of tax withholdings on equity-based payment arrangements 0 0  
Excess Tax Benefit from Share-based Compensation, Financing Activities   0  
Net cash (used for) provided by financing activities (4,893) 15,148  
Increase in cash 0 0  
Cash at beginning of period 0 0 0
Cash at end of period 0 0 0
Eliminations      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net earnings (loss) (1,064) 6,545  
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:      
Depreciation and amortization 0 0  
Equity-based compensation expense 0 0  
Deferred tax expense (benefit) (1,138) 1,857  
Employee benefit plans 0 0  
Amortization of Financing Costs and Discounts 0 0  
Gain (Loss) on Disposition of Assets   0  
Other Noncash Income Tax Expense 0 0  
Changes in working capital, net 0 0  
Change in taxes receivable, net 0 10,253  
Excess tax benefits from equity share-based payment arrangements   0  
Funding of qualified pension plans   0  
Other Operating Activities, Cash Flow Statement 0 0  
Net cash provided by operating activities (2,202) 18,655  
CASH FLOWS FROM INVESTING ACTIVITIES      
Change in short-term investments, net 0 0  
Additions to plant and equipment 0 0  
Proceeds from Sale of Productive Assets   0  
Net cash used for investing activities 0 0  
CASH FLOWS FROM FINANCING ACTIVITIES      
Payments for Repurchase of Common Stock 0 0  
Investment (to) from Parent 2,202 (18,655)  
Proceeds from Lines of Credit 0    
Repayments of Lines of Credit 0    
Payment of tax withholdings on equity-based payment arrangements 0 0  
Excess Tax Benefit from Share-based Compensation, Financing Activities   0  
Net cash (used for) provided by financing activities 2,202 (18,655)  
Increase in cash 0 0  
Cash at beginning of period 0 0 0
Cash at end of period $ 0 $ 0 $ 0