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Supplemental Guarantor Financial Information - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ (424)	$ 3,837	$ 6,961	$ 2,600	$ 3,413	$ 9,561
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	28,517		25,177		54,353	50,344
Equity-based compensation expense					2,070	343
Deferred tax expense (benefit)					5,180	2,649
Amortization of Financing Costs and Discounts					938	716
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities					(792)	410
Changes in working capital, net					(50,146)	36,317
Change in taxes receivable, net					(1,642)	11,498
Increase (Decrease) in Accrued Taxes Payable					(528)	346
Other Operating Activities, Cash Flow Statement					1,876	(1,296)
Net cash provided by operating activities					14,722	110,888
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to plant and equipment					(108,419)	(78,600)
Payments for (Proceeds from) Other Investing Activities					4	807
Net cash used for investing activities					(108,415)	(77,793)
CASH FLOWS FROM FINANCING ACTIVITIES
Investment (to) from Parent					0	0
Payment of tax withholdings on equity-based payment arrangements					(400)
Proceeds from (Payments for) Other Financing Activities					(1,147)	(543)
Net cash (used for) provided by financing activities					113,020	4,457
Proceeds from Short-term Debt					436,927	124,063
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect					19,327	37,552
Cash	41,800				41,800		$ 22,484
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	44,274		54,290		44,274	54,290	24,947	$ 16,738
Repayments of Short-term Debt					322,760	119,063
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	1,216		7,727		6,094	13,126
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization					46,457	39,905
Equity-based compensation expense					2,070	343
Deferred tax expense (benefit)					3,880	2,979
Amortization of Financing Costs and Discounts					938	716
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities					(792)	414
Changes in working capital, net					(64,846)	41,660
Change in taxes receivable, net					8,639	11,502
Increase (Decrease) in Accrued Taxes Payable					(540)	346
Other Operating Activities, Cash Flow Statement					1,942	(770)
Net cash provided by operating activities					3,842	110,221
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to plant and equipment					(107,155)	(77,257)
Payments for (Proceeds from) Other Investing Activities					4	793
Net cash used for investing activities					(107,151)	(76,464)
CASH FLOWS FROM FINANCING ACTIVITIES
Investment (to) from Parent					9,616	(662)
Proceeds from (Payments for) Other Financing Activities					(1,147)	(543)
Net cash (used for) provided by financing activities					122,636	3,795
Proceeds from Short-term Debt					436,927	124,063
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect					19,327	37,552
Cash	41,800				41,800		22,484
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	44,274		54,290		44,274	54,290	24,947	16,738
Repayments of Short-term Debt					322,760	119,063
Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	1,002		775		3,487	1,176
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization					7,896	10,439
Equity-based compensation expense					0	0
Deferred tax expense (benefit)					1,300	(330)
Amortization of Financing Costs and Discounts					0	0
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities					0	(4)
Changes in working capital, net					4,811	(6,051)
Change in taxes receivable, net					(254)	(4)
Increase (Decrease) in Accrued Taxes Payable					12	0
Other Operating Activities, Cash Flow Statement					(66)	(526)
Net cash provided by operating activities					17,186	4,700
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to plant and equipment					(1,264)	(1,343)
Payments for (Proceeds from) Other Investing Activities					0	14
Net cash used for investing activities					(1,264)	(1,329)
CASH FLOWS FROM FINANCING ACTIVITIES
Investment (to) from Parent					(15,922)	(3,371)
Proceeds from (Payments for) Other Financing Activities					0	0
Net cash (used for) provided by financing activities					(15,922)	(3,371)
Proceeds from Short-term Debt					0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect					0	0
Cash	0				0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			0			0	0	0
Repayments of Short-term Debt					0	0
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	(2,642)		(1,541)		(6,168)	(4,741)
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)					0	0
Amortization of Financing Costs and Discounts					0	0
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities						0
Changes in working capital, net					9,889	708
Change in taxes receivable, net					(10,027)	0
Increase (Decrease) in Accrued Taxes Payable					0	0
Other Operating Activities, Cash Flow Statement					0	0
Net cash provided by operating activities					(6,306)	(4,033)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to plant and equipment					0	0
Payments for (Proceeds from) Other Investing Activities					0	0
Net cash used for investing activities					0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Investment (to) from Parent					6,306	4,033
Proceeds from (Payments for) Other Financing Activities					0	0
Net cash (used for) provided by financing activities					6,306	4,033
Proceeds from Short-term Debt					0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect					0	0
Cash	$ 0				0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			$ 0			0	$ 0	$ 0
Repayments of Short-term Debt					$ 0	$ 0

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