Additional Information Related to Equity-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	$ 6,411	$ 6,236	$ 3,861
Unrecognized Equity-Based Compensation	10,420
Weighted Average Years Remaining of Equity-Based Compensation
SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	2,377	2,488	2,252
Unrecognized Equity-Based Compensation	1,338
Weighted Average Years Remaining of Equity-Based Compensation	1 year 9 months 18 days
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	2,958	2,871	832
Unrecognized Equity-Based Compensation	7,526
Weighted Average Years Remaining of Equity-Based Compensation	2 years
DSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	377	419	703
Unrecognized Equity-Based Compensation	64
Weighted Average Years Remaining of Equity-Based Compensation	2 months 12 days
Equity-Based Compensation
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	5,712	5,778	3,787
Unrecognized Equity-Based Compensation	8,928
Weighted Average Years Remaining of Equity-Based Compensation
Non- Controlling Interest
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	699	458	74
Unrecognized Equity-Based Compensation	$ 1,492
Weighted Average Years Remaining of Equity-Based Compensation	2 years 7 months 6 days