Basis of Presentation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
First Quarter Fiscal Year 2014 [Member]
Summary Of Significant Policies [Line Items]
Guideline used to determine the end date of first quarter	91 days
Fiscal Second Quarter 2014 [Member]
Summary Of Significant Policies [Line Items]
Reporting period	91 days
Fiscal Third Quarter 2014 [Member]
Summary Of Significant Policies [Line Items]
Reporting period	91 days