Earnings Per Share - Additional Information (Detail) (Contingent Convertible Preferred Stock)	6 Months Ended
	Jun. 30, 2012
Earnings Per Share Disclosure [Line Items]
Terms of conversion	Shares will potentially convert to shares of the Company's common stock in tranches of 659,926 and 439,951 shares on the third and fifth anniversary of the closing of the Acquisition, respectively, if certain revenue targets are achieved.
More Than Two and Within Three Years from Balance Sheet Date and Thereafter
Earnings Per Share Disclosure [Line Items]
Conversion to common stock shares if revenue targets are achieved	659,926
More than Three and within Five Years from Balance Sheet Date
Earnings Per Share Disclosure [Line Items]
Conversion to common stock shares if revenue targets are achieved	439,951