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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 920,964	$ 855,872
Ending balance	$ 936,227	$ 910,289	936,227	910,289
Accumulated other comprehensive loss, net	33,997		33,997			$ 359
Retained earnings	299,990		299,990			258,076
Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(26,691)		(249)
Balance after reclassification adjustments on January 1, 2018						(1,458)
Other comprehensive income (loss) before reclassifications	(9,020)		(34,253)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	0		0
Net current-period other comprehensive income (loss)	(9,020)		(34,253)
Ending balance	(35,711)		(35,711)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0		88
Balance after reclassification adjustments on January 1, 2018						0
Other comprehensive income (loss) before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income (loss) to net income	0		0
Net current-period other comprehensive income (loss)	0		0
Ending balance	0		0
Total Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(26,691)	(3,366)	(161)	(2,681)
Balance after reclassification adjustments on January 1, 2018						(1,458)
Other comprehensive income (loss) before reclassifications	(9,020)	12,130	(34,253)	11,445
Amounts reclassified from accumulated other comprehensive income (loss) to net income	0	(1,942)	0	(1,942)
Net current-period other comprehensive income (loss)	(9,020)	10,188	(34,253)	9,503
Ending balance	(35,711)	6,822	(35,711)	6,822
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	503	(1,506)	(198)	(2,211)
Balance after reclassification adjustments on January 1, 2018						(240)
Other comprehensive income (loss) before reclassifications	1,403	(420)	2,049	(219)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(192)	468	(95)	972
Net current-period other comprehensive income (loss)	1,211	48	1,954	753
Ending balance	1,714	(1,458)	1,714	(1,458)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(26,188)	(4,872)	(359)	(4,892)
Balance after reclassification adjustments on January 1, 2018						(1,698)
Other comprehensive income (loss) before reclassifications	(7,617)	11,710	(32,204)	11,226
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(192)	(1,474)	(95)	(970)
Net current-period other comprehensive income (loss)	(7,809)	10,236	(32,299)	10,256
Ending balance	(33,997)	5,364	(33,997)	5,364
Retained Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			258,076	193,698
Ending balance	$ 299,990	$ 235,938	$ 299,990	$ 235,938
ASU 2018-02 | Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					$ (256)
ASU 2018-02 | Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					0
ASU 2018-02 | Total Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(256)
ASU 2018-02 | Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(42)
ASU 2018-02 | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(298)
Accounting Standards Update 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption						$ 0
Accounting Standards Update 2016-01 | Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(953)
Accounting Standards Update 2016-01 | Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(88)
Accounting Standards Update 2016-01 | Total Unrealized Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(1,041)
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(1,041)
Accounting Standards Update 2016-01 | Retained Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					1,041
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					(1,300)
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Retained Earnings
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption					$ 1,300

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