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Comprehensive Income - Summary of (Gains) Losses Reclassified from AOCI into Condensed Consolidated Statements of Income and Affected Financial Statement Line Item (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other expense (income), net $ 11,659 $ 3,056 $ 8,798 $ (1,788)
Total before income taxes       (5,004)
Income tax expense       (1,927)
Total net of income taxes       (3,077)
Interest expense (25,487) (24,799) (50,827) (49,502)
Service revenues (1,074,366) (1,035,476) (2,104,340) (2,040,764)
Total before income taxes 5,092 857 10,584 2,026
Income tax benefit 1,590 736 3,246 1,530
Total net of income taxes 3,502 121 7,338 496
Amortization of prior service costs   20   40
Amortization of actuarial losses 232 173 455 345
Total before income taxes 232 193 455 385
Income tax benefit 85 72 168 144
Total net of income taxes 147 121 287 241
Other Nonoperating Income (Expense) [Member] | Marketable Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other expense (income), net       (5,004)
Other Nonoperating Income (Expense) [Member] | Derivative Instruments [Member] | Interest Rate Swaps [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 3,090 3,115 6,103 6,195
Other Nonoperating Income (Expense) [Member] | Derivative Instruments [Member] | Foreign Exchange Forward Contracts [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Service revenues $ 2,002 $ (2,258) $ 4,481 $ (4,169)