XML 30 R76.htm IDEA: XBRL DOCUMENT v2.4.1.9
Retirement Savings Plan - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Employer matching contributions vesting period 2 years    
United States      
Defined Benefit Plan Disclosure [Line Items]      
Employer matching contributions $ 579us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_US		 $ 1,000us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_US		 $ 1,200us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_US
Canada      
Defined Benefit Plan Disclosure [Line Items]      
Employer matching contributions $ 26us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_CA		 $ 157us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_CA		 $ 232us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_StatementGeographicalAxis
= country_CA