Outstanding and Exercisable Stock Options by Exercise Price (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	546
Weighted-Average Remaining Contractual Life	1 year 3 months 18 days
Weighted-Average Exercise Price	$ 20.72
Under $10.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	1
Weighted-Average Remaining Contractual Life	5 years
Weighted-Average Exercise Price	$ 8.59
$10.01-$20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	385
Weighted-Average Remaining Contractual Life	1 year 7 months 6 days
Weighted-Average Exercise Price	$ 13.42
$20.01-$30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	1
Weighted-Average Remaining Contractual Life	4 years
Weighted-Average Exercise Price	$ 24.41
$30.01-$40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	133
Weighted-Average Remaining Contractual Life	3 months 18 days
Weighted-Average Exercise Price	$ 36.38
Over $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options at Year End	26
Weighted-Average Remaining Contractual Life	1 year 1 month 6 days
Weighted-Average Exercise Price	$ 49.46