Debt - 6.75% Senior Notes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012
Debt Instrument [Line Items]
Write-off of deferred financing costs	$ 1,845,000	$ 1,681,000
6.75% Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of outstanding debt			152,200,000
Debt Instrument, maturity date	Nov. 15, 2014
Interest rate of Senior Notes	6.75%
First semi-annual interest payment date	May 15
Second semi-annual interest payment date	November 15
Debt instrument, maturity year	2014
Write-off of deferred financing costs	$ 500,000