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Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated and Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 968,435  
Ending balance $ 994,386   994,386  
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (30,204) $ (49,352) (35,610) $ (53,171)
Other comprehensive (loss) income before reclassifications, net of income tax (10,713) 7,702 (5,307) 11,521
Amounts reclassified from accumulated other comprehensive loss to the condensed consolidated statement of operations and comprehensive income, net of income tax   0   0
Net current-period other comprehensive (loss) income (10,713) 7,702 (5,307) 11,521
Ending balance (40,917) (41,650) (40,917) (41,650)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (396) 321 (208) 932
Other comprehensive (loss) income before reclassifications, net of income tax 1,398 (509) 971 (796)
Amounts reclassified from accumulated other comprehensive loss to the condensed consolidated statement of operations and comprehensive income, net of income tax 118 (190) 357 (514)
Net current-period other comprehensive (loss) income 1,516 (699) 1,328 (1,310)
Ending balance 1,120 (378) 1,120 (378)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (30,600) (49,031) (35,818) (52,239)
Other comprehensive (loss) income before reclassifications, net of income tax (9,315) 7,193 (4,336) 10,725
Amounts reclassified from accumulated other comprehensive loss to the condensed consolidated statement of operations and comprehensive income, net of income tax 118 (190) 357 (514)
Net current-period other comprehensive (loss) income (9,197) 7,003 (3,979) 10,211
Ending balance $ (39,797) $ (42,028) $ (39,797) $ (42,028)