Summary of Treasury Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Schedule of Treasury Stock [Line Items]
Beginning Balance, Shares	3,694,935
Restricted stock withholdings	333,507	[1]
Restricted stock forfeitures	786
Ending Balance, Shares	4,029,228
Beginning Balance, Cost	$ 51,946
Restricted stock withholdings	9,776	[1]
Restricted stock forfeitures
Ending Balance, Cost	$ 61,722

[1] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values ranging from $28.84 to $30.75 per share.