Derivative Financial Instruments Derivative Financial Instruments (Interest Rate Cap Derivative Summary) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Interest Rate Cap Two Hundred Fifteen Million Notional May Two Thousand Sixteen Maturity | Not Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	May 03, 2016
Notional amount	$ 215,000
Fair Value as of End of Period	$ 0
Interest Rate Cap Fifty Six Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity | Not Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Aug. 22, 2016
Notional amount	$ 56,500
Fair Value as of End of Period	$ 2
Interest Rate Cap One Hundred Million Notional March Two Thousand Seventeen Maturity | Not Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Mar. 21, 2017
Notional amount	$ 100,000
Fair Value as of End of Period	$ 69
Interest Rate Cap Seventy Five Million Notional November Two Thousand Sixteen Maturity | Not Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Nov. 16, 2016
Notional amount	$ 75,000
Fair Value as of End of Period	13
Total Interest Rate Cap
Interest Rate Cap Derivative Summary [Line Items]
Notional amount	796,500
Fair Value as of End of Period	$ 300
Cash Flow Hedging | Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity | Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Aug. 29, 2016
Notional amount	$ 216,500
Fair Value as of End of Period	$ 5
Cash Flow Hedging | Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity | Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Aug. 22, 2016
Notional amount	$ 43,500
Fair Value as of End of Period	$ 2
Cash Flow Hedging | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity | Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Sep. 15, 2017
Notional amount	$ 50,000
Fair Value as of End of Period	$ 112
Cash Flow Hedging | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity | Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Derivative, maturity date	Sep. 30, 2017
Notional amount	$ 40,000
Fair Value as of End of Period	97
Cash Flow Hedging | Total Interest Rate Cap | Designated as Hedging Instrument
Interest Rate Cap Derivative Summary [Line Items]
Notional amount	350,000
Fair Value as of End of Period	$ 216