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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Deferred tax assets $ 4,611,000   $ 4,611,000   $ 4,611,000
Deferred tax assets, valuation allowance 0   0   0
Provision for income taxes $ 4,247,000 $ 1,489,000 $ 7,394,000 $ 1,562,000