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Changes in Accumulated Other Comprehensive Income (Loss) By Component (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), Net of Tax [Roll Forward]        
Beginning balance     $ 855,872 $ 553,902
Ending balance $ 910,289 $ 680,552 910,289 680,552
Unrealized Gains (Losses) on Available-For-Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (3,366) (363) (2,681) (4,602)
Other comprehensive income (loss) before reclassifications 12,130 5,258 11,445 9,513
Amounts reclassified from accumulated other comprehensive income (loss) to net income (1,942) 0 (1,942) (16)
Net current-period other comprehensive income (loss) 10,188 5,258 9,503 9,497
Ending balance 6,822 4,895 6,822 4,895
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (547)   (584)
Other comprehensive income (loss) before reclassifications   (221)   (184)
Amounts reclassified from accumulated other comprehensive income (loss) to net income   0   0
Net current-period other comprehensive income (loss)   (221)   (184)
Ending balance   (768)   (768)
Total Unrealized Gains (Losses)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (910)   (5,186)
Other comprehensive income (loss) before reclassifications   5,037   9,329
Amounts reclassified from accumulated other comprehensive income (loss) to net income   0   (16)
Net current-period other comprehensive income (loss)   5,037   9,313
Ending balance   4,127   4,127
Unrealized Gain (Loss) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,506) (4,423) (2,211) (2,798)
Other comprehensive income (loss) before reclassifications (420) (508) (219) (2,133)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 468 377 972 377
Net current-period other comprehensive income (loss) 48 (131) 753 (1,756)
Ending balance (1,458) (4,554) (1,458) (4,554)
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (4,872) (5,333) (4,892) (7,984)
Other comprehensive income (loss) before reclassifications 11,710 4,529 11,226 7,196
Amounts reclassified from accumulated other comprehensive income (loss) to net income (1,474) 377 (970) 361
Net current-period other comprehensive income (loss) 10,236 4,906 10,256 7,557
Ending balance $ 5,364 $ (427) $ 5,364 $ (427)