Long-Term Debt - Additional Information (Details) - USD ($) $ in Thousands			1 Months Ended		3 Months Ended
	Jan. 14, 2016	Mar. 31, 2015	Dec. 31, 2015	May. 31, 2014	Mar. 31, 2016	Mar. 31, 2013	Jul. 13, 2010	Dec. 31, 2009
Debt Instrument [Line Items]
Deferred financing costs, Net Carrying Amount			$ 763		$ 714
TDC [Member] | Senior Secured Notes, 8.50% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount					$ 25,000		$ 25,000
Long-term debt, stated interest rate			8.50%		8.50%		8.50%
Deferred financing costs, Net Carrying Amount			$ 200		$ 200
Interest bearing note, maturity date					Dec. 30, 2020
SDTS Credit Agreements | Series A Notes [Member]
Debt Instrument [Line Items]
Long-term debt, face amount			$ 400,000
Long-term debt, stated interest rate			3.86%
Long-Term Debt Maturity Period			10 years
Interest bearing note, maturity date					Dec. 03, 2025
SDTS Credit Agreements | Series B Notes [Member]
Debt Instrument [Line Items]
Long-term debt, face amount	$ 100,000
Long-term debt, stated interest rate	3.86%
Long-Term Debt Maturity Period	10 years
Interest bearing note, maturity date					Jan. 14, 2026
SDTS Credit Agreements | Senior Secured Notes, 7.25% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount					$ 53,500			$ 53,500
Long-term debt, stated interest rate			7.25%		7.25%			7.25%
Interest bearing note, maturity date					Dec. 30, 2029
SDTS Credit Agreements | Senior Secured Notes, 6.47% [Member]
Debt Instrument [Line Items]
Long-term debt, face amount					$ 110,000		$ 110,000
Long-term debt, stated interest rate			6.47%		6.47%		6.47%
Interest bearing note, maturity date					Sep. 30, 2030
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, face amount					$ 60,000
Long-term debt, stated interest rate					5.04%
Interest bearing note, maturity date					Jun. 20, 2018
Construction-term loan						$ 447,000
Construction term loan outstanding converted into term loan				$ 407,000
Interest rate		2.43%
Sharyland Projects, L.L.C [Member] | Senior Secured Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate					2.25%