Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2007	Dec. 31, 2003	Dec. 31, 2002	Dec. 31, 1999	Dec. 31, 1997	Dec. 31, 1996
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted since 2003		0
Stock options outstanding		0
Shares available for future grant		995,093
Compensation expense related to share-based compensation plans		$ 8,479	$ 7,833	$ 8,258
Compensation expense related to share-based compensation plans, net of tax		5,200	5,000	5,200
Total intrinsic value of options exercised		$ 0	0	0
Unrecognized compensation cost weighted average period recognized (years)		2 years 11 months 23 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted shares vested		$ 7,500	$ 8,700	$ 9,400
Unrecognized compensation cost related to non-vested share-based compensation		$ 20,800
Restricted stock grants		420,368	338,531	293,910
Restricted stock grants, Weighted average grant date fair value		$ 33.46	$ 37.60	$ 39.66
Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants, Weighted average grant date fair value	$ 43.75
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years	3 years	3 years
Minimum [Member] | Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years	5 years	5 years
Maximum [Member] | Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	5 years
1996 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved under long-term incentive plan										1,800,000
1997 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved under long-term incentive plan									600,000
1999 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved under long-term incentive plan								2,400,000
Two Thousand Two Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved under long-term incentive plan							2,400,000
Stock reserved under long-term incentive plan, number of additional shares distributed					1,000,000	2,000,000
Employees [Member] | Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	324,797
Outside Directors [Member] | Restricted Stock [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	27,500