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)
6 Months Ended
Jun. 30, 2014
Jun. 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% 23.40%
Other adjustments (5.00%) 0.30%
Effective tax rate (5.00%) 57.70%