Annual report pursuant to Section 13 and 15(d)

Acquisitions - Estimated Fair Value of Acquired Assets and Assumed Liabilities (Detail)

v2.4.1.9
Acquisitions - Estimated Fair Value of Acquired Assets and Assumed Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Feb. 19, 2013
Business Acquisition [Line Items]      
Accounts receivable $ 113,030us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables    
Inventory 187,509us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory    
Other current assets 25,224us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther    
Property and equipment 117,336us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment    
Goodwill 621,560us-gaap_Goodwill 466,227us-gaap_Goodwill  
Intangibles 822,620us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill    
Total assets acquired 1,922,765us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets    
Deferred income taxes (275,957)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent    
Total purchase price 1,399,055us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet    
Paulin [Member]      
Business Acquisition [Line Items]      
Accounts receivable     17,259us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Inventory     55,552us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Other current assets     2,701us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Property and equipment     16,121us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Goodwill     11,687us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Intangibles     18,967us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Total assets acquired     122,287us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Deferred income taxes     (5,437)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Liabilities assumed     (13,434)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember
Total purchase price     $ 103,416us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= hlm_PaulinMember