The expense related to the withdrawal from a multiemployer pension plan.

No definition available.

Name:	ctam_MultiemployerPlansWithdrawalObligationExpense
Namespace Prefix:	ctam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Restructuring Reserve, Impairment and Non-Cash Activity

+ References

No definition available.

+ Details

Name:	ctam_RestructuringReserveImpairmentandNonCashActivity
Namespace Prefix:	ctam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_RestructuringCostsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

+ Details

Name:	us-gaap_RestructuringReserveNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_OneTimeTerminationBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_ContractTerminationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=sic_Z8742
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=ctam_GainorLossondisposaloffixedassetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_InventoryValuationReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Restructuring Activity - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$ 4,252
Charges (gains)	0
Cash payments	(183)
Impairment and non-cash activity	0
Ending balance	4,069	$ 4,252
Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance	4,252	4,450	$ 8,533
Charges (gains)		566	13,394
Cash payments		(1,138)	(10,674)
Impairment and non-cash activity		374	(6,803)
Ending balance		4,252	4,450	$ 8,533
Employee termination and related benefits
Restructuring Reserve [Roll Forward]
Beginning balance	3,551
Charges (gains)	0
Cash payments	(44)
Impairment and non-cash activity	0
Ending balance	3,507	3,551
Short-term employee termination related benefits	340
Long-term liability	3,167
Employee termination and related benefits \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance	3,551	3,627	8,301
Charges (gains)		185	(854)
Cash payments		(261)	(3,820)
Impairment and non-cash activity		0	0
Ending balance		3,551	3,627	8,301
Reduction to withdrawal obligation			(1,973)	5,500
Lease termination costs
Restructuring Reserve [Roll Forward]
Beginning balance	701
Charges (gains)	0
Cash payments	(139)
Impairment and non-cash activity	0
Ending balance	562	701
Short-term employee termination related benefits	304
Long-term liability	258
Lease termination costs \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance	701	823	232
Charges (gains)		0	6,038
Cash payments		(496)	(3,160)
Impairment and non-cash activity		374	(2,287)
Ending balance		701	823	232
Moving costs associated with plant consolidations \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges (gains)		305	4,558
Cash payments		(305)	(4,558)
Impairment and non-cash activity		0	0
Ending balance		0	0	0
Professional fees \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance	$ 0	0	0
Charges (gains)		76	1,839
Cash payments		(76)	(1,839)
Impairment and non-cash activity		0	0
Ending balance		0	0	0
Loss on disposal of fixed assets \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance		0	0
Charges (gains)			1,361
Cash payments			2,703
Impairment and non-cash activity			(4,064)
Ending balance			0	0
Inventory adjustment
Restructuring Reserve [Roll Forward]
Charges (gains)			452
Inventory adjustment \| Predecessor
Restructuring Reserve [Roll Forward]
Beginning balance		$ 0	0
Charges (gains)			452
Cash payments			0
Impairment and non-cash activity			(452)
Ending balance			$ 0	$ 0