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Schedule of Principal Repayment Requirements of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 $ 63,750  
2017 191,250  
2020 300,000  
Thereafter 300,000  
Total $ 855,000 $ 985,500