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Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases [Line Items]      
Rental expense $ 3.8us-gaap_OperatingLeasesRentExpenseNet $ 3.8us-gaap_OperatingLeasesRentExpenseNet $ 3.7us-gaap_OperatingLeasesRentExpenseNet
Future minimum rental commitments, 2015 2.5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent    
Future minimum rental commitments, 2016 1.5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears    
Future minimum rental commitments, 2017 1.3us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears    
Future minimum rental commitments, 2018 1.2us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears    
Future minimum rental commitments, 2019 1.2us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears    
Future minimum rental commitments, Thereafter 11.3us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter    
Future minimum rental commitments for capital leases, 2015 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Future minimum rental commitments for capital leases, 2019 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Maximum [Member]      
Leases [Line Items]      
Future minimum rental commitments for capital leases, 2016 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Future minimum rental commitments for capital leases, 2017 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Future minimum rental commitments for capital leases, 2018 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Imputed interest maximum amount $ 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember