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, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
U.S. statutory federal income tax rate 0.00% 34.00% 34.00%
State taxes, net of U.S. federal income tax benefit 41.70% 4.00% 10.20%
Other adjustments 473.40% (4.70%) 10.50%
Effective tax rate 515.10% 33.30% 54.70%