Common Stock - Schedule of Option Outstanding and Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Option Prices, Minimum	$ 12.01
Range of Option Prices, Maximum	$ 19.01
Option Shares	1,567
Weighted-Avg. Option Price	$ 15.62
Weighted-Avg. Remaining Contractual Life, Years	2 years
$12.01 - $13.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Option Prices, Minimum	$ 12.01
Range of Option Prices, Maximum	$ 13.56
Option Shares	331
Weighted-Avg. Option Price	$ 13.10
Weighted-Avg. Remaining Contractual Life, Years	1 year
$16.21 - $19.01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Option Prices, Minimum	$ 16.21
Range of Option Prices, Maximum	$ 19.01
Option Shares	1,236
Weighted-Avg. Option Price	$ 16.29
Weighted-Avg. Remaining Contractual Life, Years	2 years