XML 29 R81.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information (Detail)
 12 Months Ended
Dec. 31, 2014
segment
Segment Reporting Information [Line Items]  
Number of reportable segments 3us-gaap_NumberOfReportableSegments
Maximum  
Segment Reporting Information [Line Items]  
Percent of target bonus charges allocated to segments 100.00%it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Percent of target bonus charges allocated to segments 100.00%it_SegmentReportingInformationPercentofTagetBonusChargesAllocatedtoSegments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember