Income Taxes - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Income Taxes [Line Items]  
Tax year subject to tax examination for U.S. Federal return For the U.S. Federal return, its tax years for 2011, 2012 and 2013 are subject to tax examination by the U.S. Internal Revenue Service through September 15, 2015, 2016 and 2017, respectively. The Company does not anticipate that the total amount of unrecognized tax benefit related to any particular tax position will change significantly within the next 12 months.
Internal Revenue Service (IRS) | Tax Year 2011  
Income Taxes [Line Items]  
U.S. Federal return, tax year subject to examination 2011
Internal Revenue Service (IRS) | Tax Year 2012  
Income Taxes [Line Items]  
U.S. Federal return, tax year subject to examination 2012
Internal Revenue Service (IRS) | Tax Year 2013  
Income Taxes [Line Items]  
U.S. Federal return, tax year subject to examination 2013
Minimum  
Income Taxes [Line Items]  
Step two threshold to quantify uncertain tax position 50.00%