Summary of Changes in Accumulated Balances of Other Comprehensive Income Loss Including Current Period Other Comprehensive Income and Reclassifications (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI balance at December 31, 2014	$ 27,466	$ 5,018
Other comprehensive income (loss) before reclassifications	14,363	23,091
Less gain (loss) reclassified from AOCI	20,796	643
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(6,433)	22,448	$ 5,220
AOCI balance at December 31, 2015	21,033	27,466	5,018
Gain (loss) on cash flow hedges:
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI balance at December 31, 2014	15,906	(1,529)
Other comprehensive income (loss) before reclassifications	17,300	18,078
Less gain (loss) reclassified from AOCI	19,604	643
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2,304)	17,435
AOCI balance at December 31, 2015	13,602	15,906	(1,529)
Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI balance at December 31, 2014	11,511	6,423
Other comprehensive income (loss) before reclassifications	(2,878)	5,088
Less gain (loss) reclassified from AOCI	1,192
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(4,070)	5,088
AOCI balance at December 31, 2015	7,441	11,511	6,423
Foreign Currency Items
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI balance at December 31, 2014	49	124
Other comprehensive income (loss) before reclassifications	(59)	(75)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(59)	(75)
AOCI balance at December 31, 2015	$ (10)	$ 49	$ 124