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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (73,528)	$ (70,988)	$ (229,845)	$ (202,905)
Income before provision for income taxes	19,207	15,517	45,421	40,051
Tax (expense) benefit	(3,309)	(3,102)	(10,471)	(12,394)
Total reclassifications for the period, net of tax	15,898	12,415	34,950	27,657
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit plan adjustments – actuarial losses	(106)	(51)	(310)	(149)
Income before provision for income taxes	518	1,211	2,020	3,833
Tax (expense) benefit	(244)	(477)	(907)	(1,507)
Total reclassifications for the period, net of tax	274	734	1,113	2,326
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gain	1,066	1,268	3,031	4,383
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gain	(57)	$ (6)	(162)	$ (401)
Net Losses on Derivatives Designated as Hedging Instruments [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (385)		$ (539)

X

- Definition

Total costs related to goods produced and sold during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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