Quarterly report pursuant to Section 13 or 15(d)

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

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Summary of Significant Accounting Policies - Reconciliation between United States, or U.S, Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Accounting Policies [Abstract]    
US statutory federal income tax rate 34.00% 34.00%
State taxes, net of US federal income tax benefit 23.40% 10.20%
Other adjustments 0.30% 1.60%
Effective tax rate 57.70% 45.80%