Derivative Instruments and Hedging Activities - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($)
Accumulated other comprehensive loss:
Beginning Balance	$ 504,120
Ending Balance	458,543
Gains (Losses) on Cash Flow Hedges [Member]
Accumulated other comprehensive loss:
Beginning Balance	(13,137)
Other comprehensive loss before reclassifications	(13,603)
Amounts reclassified from accumulated other comprehensive loss to interest expense	1,371
Unrealized loss on derivatives, net of tax	(12,232)
Ending Balance	$ (25,369)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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