Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Number of geographic regions considered as reportable operating segments	3
Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2013 and 2012.	No single customer accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2013 and 2012.
Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2013 and 2012.	No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three months ended March 31, 2013 and 2012.