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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended
Oct. 04, 2013
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Oct. 31, 2013
Summary Of Significant Accounting Policy [Line Items]              
Goodwill impairment charges   $ 4.9us-gaap_GoodwillImpairmentLoss $ 4.9us-gaap_GoodwillImpairmentLoss $ 36.2us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss    
Pretax impairment charges other than goodwill   7.2us-gaap_ImpairmentOfIntangibleAssetsFinitelived   9.3us-gaap_ImpairmentOfIntangibleAssetsFinitelived 40.9us-gaap_ImpairmentOfIntangibleAssetsFinitelived    
Tax benefit   50.00%comm_IncomeTaxBenefitRealizationProbabilityPercentage          
Undistributed earnings from foreign subsidiaries   441us-gaap_UndistributedEarningsOfForeignSubsidiaries          
Product warranty term   These product warranties extend over periods ranging from one to twenty-five years from the date of sale, depending upon the product subject to the warranty.          
Advertising expense   10.5us-gaap_AdvertisingExpense   10.3us-gaap_AdvertisingExpense 7.7us-gaap_AdvertisingExpense    
Other expense, net   2.7us-gaap_ForeignCurrencyTransactionGainLossBeforeTax   9.8us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 7.0us-gaap_ForeignCurrencyTransactionGainLossBeforeTax    
Stock split of common stock 3us-gaap_StockholdersEquityNoteStockSplitConversionRatio1            
Common stock, shares authorized   1,300,000,000us-gaap_CommonStockSharesAuthorized   1,300,000,000us-gaap_CommonStockSharesAuthorized      
Common stock, par value   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare      
Preferred stock, shares authorized   200,000,000us-gaap_PreferredStockSharesAuthorized   200,000,000us-gaap_PreferredStockSharesAuthorized      
Preferred stock, par value   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare      
Amount of outstanding equity based awards not included in computation of diluted earnings per share   1,400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount   2,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 6,900,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    
IPO [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Common stock, shares authorized             1,300,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Common stock, par value             $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Preferred stock, shares authorized             200,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Preferred stock, par value             $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Customers Located Outside of the United States [Member] | Sales Revenue, Net [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Percentage of net sales   45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		   45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		 47.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		 47.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		  
Selling, General and Administrative Expense [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Selling, general and administrative expense   $ 27.2us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		   $ 27.3us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 25.2us-gaap_ShippingHandlingAndTransportationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		    
Minimum [Member] | Buildings and Improvements [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Estimated useful lives of the assets   10 years          
Minimum [Member] | Machinery and Equipment [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Estimated useful lives of the assets   3 years          
Maximum [Member] | Buildings and Improvements [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Estimated useful lives of the assets   35 years          
Maximum [Member] | Machinery and Equipment [Member]              
Summary Of Significant Accounting Policy [Line Items]              
Estimated useful lives of the assets   10 years