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Benefit Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Jun. 30, 2013
Age
Defined Benefit Plan Disclosure [Line Items]    
Recorded gain from termination of post retirement benefit liability   $ 543
Pension Plan, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Minimum eligibility for full-time employees, age   21
Period of service credit by employee   1 year
Amount contributed to pension plan, Expected in future   500
Amount of contributed made to pension plan $ 500