XML 18 R70.htm IDEA: XBRL DOCUMENT v2.4.1.9
Benefit and Incentive Compensation Plans and Other - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contribution to Savings Plan $ 142us-gaap_DefinedContributionPlanCostRecognized $ 156us-gaap_DefinedContributionPlanCostRecognized $ 108us-gaap_DefinedContributionPlanCostRecognized
Time Based Restricted Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based award vesting period 5 years    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based award vesting period 5 years