Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reconciliation between U.S. Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)

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Summary of Significant Accounting Policies - Reconciliation between U.S. Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
U.S. statutory federal income tax rate 0.00% 0.00% 0.00%
State taxes, net of U.S. federal income tax benefit 0.00% 26.90% 41.70%
Other adjustments 0.00% 0.00% 473.40%
Effective tax rate 0.00% 26.90% 515.10%