Annual report pursuant to Section 13 and 15(d)

Transaction, Acquisition, and Integration Expenses - Additional Information (Detail)

v2.4.1.9
Transaction, Acquisition, and Integration Expenses - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 29, 2014
Dec. 31, 2013
Dec. 31, 2012
Successor [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Transaction expenses relating to acquisition $ 22,719us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember 		     
Successor [Member] | CCMP Capital Advisors, LLC [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Transaction expenses relating to acquisition 15,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hlm_CapitalAdvisorsLlcMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember 		     
Predecessor [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Transaction expenses relating to acquisition   31,681us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember 		8,638us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember 		3,031us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor [Member] | Paulin [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Transaction expenses relating to acquisition     8,638us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember 		 
Predecessor [Member] | Ook And Paulin [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Transaction expenses relating to acquisition       $ 3,031us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= hlm_OokAndPaulinMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember