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Income Tax Effects Related to Components of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]        
Foreign currency translation adjustments, Before-Tax Amount $ 832 $ (943) $ 2,347 $ (199)
Net change in unrealized gains (losses) on available for sale securities, Before-Tax Amount 131,213 (18,115) 56,511 (18,115)
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount (315) (227) 1,033 214
Other comprehensive (loss) income, Before-Tax Amount 131,730 (19,285) 59,891 (18,100)
Foreign currency translation adjustments, Tax Effect 0 0 0 0
Other comprehensive (loss) income, Tax Effect 124 89 (397) (85)
Foreign currency translation adjustments, Net 832 (943) 2,347 (199)
Other comprehensive (loss) income, Net 131,854 (19,196) 59,494 (18,185)
Unrealized Net Gains (Losses) on Available for Sale Securities [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Available for sale securities, net loss arising during the period, Before-Tax Amount (10,952) (18,115) (85,654) (18,115)
Available for sale securities, net loss reclassified into income, Before-Tax Amount 142,165 0 142,165 0
Net change in unrealized gains (losses) on available for sale securities, Before-Tax Amount 131,213 (18,115) 56,511 (18,115)
Available for sale securities, net loss arising during the period, Tax Effect 1 0 2 0
Available for sale securities, net loss reclassified into income, Tax Effect 0 0 0 0
Net change in unrealized gains (losses) on available for sale securities, Tax Effect 1 0 2 0
Available for sale securities, net loss arising during the period, Net (10,951) (18,115) (85,652) (18,115)
Available for sale securities, net loss reclassified into income, Net 142,165 0 142,165 0
Net change in unrealized gains (losses) on available for sale securities, Net 131,214 (18,115) 56,513 (18,115)
Other comprehensive (loss) income, Net     56,513 (18,115)
Derivatives Qualifying as Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount (315) (227) 1,033 214
Derivatives qualifying as cash flow hedges, net gain (loss), Tax Effect 123 89 (399) (85)
Derivatives qualifying as cash flow hedges, net gain (loss), Net (192) (138) 634 129
Derivatives Qualifying as Cash Flow Hedges [Member] | Foreign Exchange Contract [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Derivatives qualifying as cash flow hedges, net gains (losses) arising during the period, Before-Tax Amount 434 (141) 2,307 201
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Before-Tax Amount (749) (86) (1,274) 13
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount (315) (227) 1,033 214
Derivatives qualifying as cash flow hedges, net (losses) gains arising during the period, Tax Effect (169) 55 (896) (80)
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Tax Effect 292 34 497 (5)
Derivatives qualifying as cash flow hedges, net gain (loss), Tax Effect 123 89 (399) (85)
Derivatives qualifying as cash flow hedges, net (losses) gains arising during the period, Net 265 (86) 1,411 121
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Net (457) (52) (777) 8
Derivatives qualifying as cash flow hedges, net gain (loss), Net $ (192) $ (138) 634 129
Other comprehensive (loss) income, Net     $ 634 $ 129