Quarterly report pursuant to Section 13 or 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)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Accounting Policies [Abstract]    
U.S. statutory federal income tax rate 0.00% 34.00%
State taxes, net of U.S. federal income tax benefit 0.00% 23.60%
Other adjustments 12.60% 12.20%
Effective tax rate 12.60% 69.80%