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Investments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financial Instruments [Line Items]          
Unrealized gains (losses) on investments $ 81,000   $ (108,000) $ 233,000 $ (243,000)
Cash collateral percentage   100.00%      
Outstanding borrowings under the Credit Agreement 0     $ 0  
Credit Agreement [Member]          
Financial Instruments [Line Items]          
Revolving credit facility   $ 120,000,000      
Revolving credit facility maturity date       Jun. 30, 2016  
CCKF [Member]          
Financial Instruments [Line Items]          
Non controlling interest $ 4,200,000     $ 4,200,000  
Percentage of investment in equity affiliate 30.70%     30.70%  
Maximum [Member] | CCKF [Member]          
Financial Instruments [Line Items]          
Income (loss) from investment in affiliate       $ (100,000)  
Municipal Bond [Member]          
Financial Instruments [Line Items]          
Period debt obligations mature, years, maximum       1 year  
Unrealized gains (losses) on investments       $ 500,000