Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (7,984)	$ (122)
Other comprehensive (loss) before reclassifications	2,667	(925)
Amounts reclassified from accumulated other comprehensive loss to net income	(16)	0
Net current-period other comprehensive (loss)	2,651	(925)
Ending balance	(5,333)	(1,047)
Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(4,602)	1,156
Other comprehensive (loss) before reclassifications	4,255	121
Amounts reclassified from accumulated other comprehensive loss to net income	(16)	0
Net current-period other comprehensive (loss)	4,239	121
Ending balance	(363)	1,277
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(584)	(14)
Other comprehensive (loss) before reclassifications	37	122
Amounts reclassified from accumulated other comprehensive loss to net income	0	0
Net current-period other comprehensive (loss)	37	122
Ending balance	(547)	108
Total Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(5,186)	1,142
Other comprehensive (loss) before reclassifications	4,292	243
Amounts reclassified from accumulated other comprehensive loss to net income	(16)	0
Net current-period other comprehensive (loss)	4,276	243
Ending balance	(910)	1,385
Unrealized Loss on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(2,798)	(1,264)
Other comprehensive (loss) before reclassifications	(1,625)	(1,168)
Amounts reclassified from accumulated other comprehensive loss to net income	0	0
Net current-period other comprehensive (loss)	(1,625)	(1,168)
Ending balance	$ (4,423)	$ (2,432)