Unrecognized Share Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	$ 11,740
Average Expected Recognition Period	3 years 8 months 16 days
Stock Option Awards
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	1,345
Average Expected Recognition Period	4 years 1 month 21 days
Restricted Stock Award
Unrecognized Share Based Compensation Expense [Line Items]
Unrecognized Expense	$ 10,395
Average Expected Recognition Period	3 years 7 months 24 days