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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]            
Provision for income taxes     $ 211 $ 0 $ 420 $ 43
Charitable contribution, expiry period         2019  
Low-income housing, expiry period         2034  
Net operating loss carryforwards, expiry period         2032  
Cumulative loss position, representing significant negative evidence against the realizability of the deferred tax asset 3 years 3 years