Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Maximum	Mar. 31, 2013 Maximum	Dec. 31, 2013 Tax loss carrybacks to 2010 and 2011
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense	$ 6,648,000	$ 14,902,000
Effective tax rate	37.30%	35.90%
Federal statutory income tax rate	35.00%
Accrued interest related to unrecognized tax benefit			100,000	100,000
Unrecognized Tax Benefits					9,500,000
Proceeds from income tax refunds					$ 59,100,000