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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ 855,872 $ 553,902
Ending balance $ 910,642 $ 789,811 910,642 789,811
Unrealized Gains (Losses) on Available-For-Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance 6,822 4,895 (2,681) (4,602)
Other comprehensive income (loss) before reclassifications (2,177) 15 9,268 9,529
Amounts reclassified from accumulated other comprehensive income (loss) to net income (3,263) 1 (5,205) (16)
Net current-period other comprehensive income (loss) (5,440) 16 4,063 9,513
Ending balance 1,382 4,911 1,382 4,911
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (768)   (584)
Other comprehensive income (loss) before reclassifications   190   6
Amounts reclassified from accumulated other comprehensive income (loss) to net income   0   0
Net current-period other comprehensive income (loss)   190   6
Ending balance   (578)   (578)
Total Unrealized Gains (Losses)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   4,127   (5,186)
Other comprehensive income (loss) before reclassifications   205   9,535
Amounts reclassified from accumulated other comprehensive income (loss) to net income   1   (16)
Net current-period other comprehensive income (loss)   206   9,519
Ending balance   4,333   4,333
Unrealized Loss on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,458) (4,554) (2,211) (2,798)
Other comprehensive income (loss) before reclassifications 104 556 (115) (1,577)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 349 439 1,321 816
Net current-period other comprehensive income (loss) 453 995 1,206 (761)
Ending balance (1,005) (3,559) (1,005) (3,559)
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance 5,364 (427) (4,892) (7,984)
Other comprehensive income (loss) before reclassifications (2,073) 761 9,153 7,958
Amounts reclassified from accumulated other comprehensive income (loss) to net income (2,914) 440 (3,884) 800
Net current-period other comprehensive income (loss) (4,987) 1,201 5,269 8,758
Ending balance $ 377 $ 774 $ 377 $ 774