Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 4,050
Average Expected Recognition Period	2 years 3 months 18 days
Stock option awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	1,606
Average Expected Recognition Period	2 years 1 month 6 days
Restricted stock awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 2,444
Average Expected Recognition Period	2 years 4 months 24 days