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Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance $ 509,457 $ 563,352 $ 492,868
Other comprehensive (loss) income 810 (792) (92)
Balance 321,673 509,457 563,352
Unrealized Gains and (Losses) on Securities Available-for-Sale [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (465) (107)  
Unrealized net gain (loss) on available-for-sale securities and foreign currency translation adjustments, net of tax 241 (358)  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Other comprehensive (loss) income 241 (358)  
Balance (224) (465) (107)
Other comprehensive income (loss), before reclassifications, tax (32) 71  
Foreign Currency Translation Adjustments [Member]      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance (569) (135)  
Unrealized net gain (loss) on available-for-sale securities and foreign currency translation adjustments, net of tax 569 (434)  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Other comprehensive (loss) income 569 (434)  
Balance 0 (569) $ (135)
Other comprehensive income (loss), before reclassifications, tax $ (348) $ 266