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Summary of Significant Accounting Policies (Debt Issuance Costs) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Issuance Costs, Net [Abstract]      
Debt issuance costs related to amendment   $ 3,795  
Capitalized debt issuance costs $ 11,400 11,400  
Accumulated amortization of debt issuance costs 6,000 4,800  
Amortization expense related to capitalized debt issuance costs $ 1,356 $ 1,251 $ 1,094