Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Tax Computed at the Statutory Federal Rate (Parenthetical) (Detail)

v2.4.1.9
Income Taxes - Reconciliation of Tax Computed at the Statutory Federal Rate (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Income tax benefit computed at statutory federal rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate